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INTRODUCTION: The curative treatment of primary hyperparathyroidism (PPH) is surgical and today it can be performed by minimally invasive surgery (MIS) and also be radioguided (RG) if a radiopharmaceutical with affinity for the parathyroid tissue that can be detected with gamma-detector probes or with a portable gamma camera (PGC) is injected. AIM: The objective is to assess whether intraoperative scintigraphy (GGio) with PGC can replace intraoperative pathological anatomy (APio) to determine if the removed specimen is an abnormal parathyroid. MATERIAL AND METHOD: 92 patients underwent CMI RG--HPP with PGC after the administration of a dose of 99 mTc-MIBI. The information provided by the PGC in the analysis of the excised specimens is qualitatively compared (capture yes/no) with the result of the intraoperative pathological anatomy (APio). The Gold standard is the definitive histology. RESULTS: 120 excised pieces are evaluated with GGio and APio. There were 110 agreements (95TP and 15TN) and 10 disagreements (3FP and 7FN). Of the 120 lesions, 102 were parathyroid and 18 were non-parathyroid. There was good agreement between intraoperative scintigraphy imaging (GGio) and PA, 70.1% according to Cohen's Kappa index. The GGio presented the following values ​​of Sensitivity, Specificity, Positive Predictive Value, Negative Predictive Value, Positive Likelihood Ratio, Negative Likelihood Ratio and Overall Value of the Test (93.1%, 83.3%, 96.9%, 68.2%, 5.59, 0.08 and 0.92 respectively). CONCLUSION: GGio is a rapid and effective surgical aid technique to confirm/rule out the possible parathyroid nature of the lesions removed in PPH surgery, but it cannot replace histological study.

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Abstract Primary hyperparathyroidism (PHPT) is characterized by elevated levels of calcium and parathyroid hormone (PTH). However, the interpretation of diagnostic tests, such as serum calcium and PTH levels, is complex in pregnant women. The aim of this report is to present a case of PHTP in a pregnant adolescent, with a special emphasis on an uncommon complication, as well as diagnostic and treatment strategies. A 17-year-old pregnant female presented with hyper emesis gravidarum and neurological symptoms, leading to the diagnosis of cerebral venous thrombosis. Further investigations revealed hypercalcemia and persistently elevated PTH levels, consistent with PHPT. After local ization studies, the patient underwent an emergency parathyroidectomy with a diagnosis of parathyroid ad enoma. During follow-up, intrauterine growth restric tion and severe preeclampsia developed, necessitating an emergency cesarean section. Both the mother and neonate had favorable outcomes. PHPT is an infrequent condition in the pregnant population, and its diagnosis can be challenging due to the overlap of symptoms with normal physiological changes during pregnancy. The occurrence of uncom mon complications, such as thrombotic phenomena, highlights the need for a comprehensive approach to ensure early detection and management. In most cases, parathyroidectomy is the treatment of choice.

Resumen El hiperparatiroidismo primario (HPTP) se caracteriza por niveles elevados de calcio y hormona paratiroidea (PTH). Sin embargo, la interpretación de pruebas diag nósticas, como los niveles de calcio sérico y PTH, es compleja en mujeres embarazadas. El objetivo de este re porte es presentar un caso de HPTP en una adolescente embarazada, con especial hincapié en una complicación infrecuente, así como en las estrategias diagnósticas y de tratamiento. Una mujer embarazada de 17 años presentó hiperé mesis gravídica y síntomas neurológicos, lo que llevó al diagnóstico de trombosis venosa cerebral. Posterio res investigaciones revelaron hipercalcemia y niveles persistentemente elevados de PTH, consistentes con HPTP. Tras la realización de estudios de localización, la paciente fue sometida a una paratiroidectomía de emergencia con diagnóstico de adenoma de paratiroi des. Durante el seguimiento, se desarrolló restricción del crecimiento intrauterino y preeclampsia grave, lo que resultó en la necesidad de realizar una cesárea de emergencia. Tanto la madre como el neonato evolucio naron favorablemente. El HPTP es una condición infrecuente en la población embarazada y su diagnóstico puede ser desafiante por la superposición de síntomas con los cambios fisiológicos normales del embarazo. La aparición de complicaciones infrecuentes, como fenómenos trombóticos, resalta la necesidad de un abordaje integral para garantizar la detección y el manejo temprano. En la mayoría de los casos, la paratiroidectomía es el tratamiento de elección.

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Preoperative localization of parathyroid pathology, generally a parathyroid adenoma, can be difficult in some cases due to the anatomical variants that these glands present. The objective of this review is to analyse the different imaging techniques used for preoperative localization of parathyroid pathology (scintigraphy, ultrasound, CT, MRI and PET). There is great variability between the different tests for the preoperative localization of parathyroid pathology. The importance of knowing the different diagnostic options lies in the need to choose the most suitable test at each moment and for each patient for an adequate management of primary hyperparathyroidism (PHP) with surgical criteria.

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Las neoplasias endocrinas múltiples engloban una serie de síndromes caracterizados por su origen genético y la afectación de una o más glándulas. Se describe el caso de un paciente masculino, de 23 años, con antecedentes de salud de nesidioblastosis diagnosticado a los 16 años de edad, quien acudió al Hospital General Docente Ambato por presentar convulsiones tónico clónicas, e hipoglucemia severa con posterior estatus epiléptico. Los estudios de laboratorio mostraron hiperparatiroidismo primario, y los de imagen identificaron lesiones sugerentes de adenoma paratiroideo e insulinoma de cabeza de páncreas. Después de analizar el caso, se identificaron dos criterios para plantear una neoplasia endocrina múltiple tipo 1: presencia de insulinoma e hiperparatiroidismo primario. Además de tratamiento con bifosfonato, se planificó interconsulta con el servicio de Genética, para estudio del paciente y familiares; y con Cirugía General, para programación de resolución quirúrgica. Debido a la poca frecuencia de esta enfermedad, resulta de interés describir el caso, con el objetivo de exponer las principales manifestaciones clínicas y conducta a seguir. Constituye una prioridad el diagnóstico de su causa en cada paciente.

Multiple endocrine neoplasias encompass a series of syndromes characterized by their genetic origin and the involvement of one or more glands. A 23-years-old male patient with a health history of nesidioblastosis diagnosed at 16 years of age, who attended the Ambato General Teaching Hospital with tonic-clonic seizures and severe hypoglycemia with subsequent epileptic status, is described. Laboratory studies showed primary hyperparathyroidism, and imaging identified lesions suggestive of parathyroid adenoma and insulinoma of the head of the pancreas. After analyzing the case, two criteria were identified to suggest multiple endocrine neoplasia type 1: presence of insulinoma and primary hyperparathyroidism. In addition to treatment with bisphosphonate, consultation with the Genetics service was planned for study of the patient and family members; and with General Surgery, for scheduling surgical resolution. Due to the infrequency of this disease, it is of interest to describe the case, with the aim of exposing the main clinical manifestations and conduct to follow. Diagnosing its cause in each patient is a priority.

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Abstract Hyperparathyroidism-induced hypercalcemic crisis (HIHC) is an unusual state of marked progressive pri mary hyperparathyroidism (PHPT). Patients have severe hypercalcemia and may have severe symptoms such as kidney failure, acute pancreatitis, and mental changes. PHPT is due to the presence of a single gland adenoma/ disease in 80 to 85%; parathyroid carcinoma is reported in <1%. Among patients with adenoma, atypical parathy roid tumor can be found infrequently. Parathyroidectomy is the only curative approach for PHPT. In this report we present three cases of HIHC due to giant parathyroid adenomas (GPAs), one of them with histopathological characteristics of an atypical parathyroid tumor, with satisfactory evolution after parathyroidectomy.

Resumen La crisis hipercalcémica inducida por hiperparatiroi dismo (HIHC) es un estado inusual de hiperparatiroidis mo primario progresivo y marcado (HPTP). Los pacientes tienen hipercalcemia grave y pueden tener síntomas graves como insuficiencia renal, pancreatitis aguda y cambios mentales. El HPTP se debe a la presencia de un adenoma/enfermedad de una sola glándula en 80 a 85%; el carcinoma de paratiroides se informa en <1%. Entre los pacientes con adenoma, el tumor paratiroideo atípico se puede encontrar con baja frecuencia. La paratiroidec tomía es el único abordaje curativo del HPTP. En este reporte presentamos tres casos de HIHC por adenomas paratiroideos gigantes (APGs), uno de ellos con características histopatológicas de tumor paratiroideo atípico, con evolución satisfactoria luego de paratiroidectomía.

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BACKGROUND AND OBJECTIVE: Postparathyroidectomy normocalcemic hyperparathyroidism (PPNCHPPT) is a frequent situation for which we have no information in our country. The objective is to know our prevalence of PPNCHPPT, the associated etiological factors, the predictive markers, the treatment administered and the evolution. PATIENTS AND METHOD: Retrospective observational cross-sectional study on 42 patients. Twelve patients with PPNCHPPT and 30 without PPNCHPPT are compared. RESULTS: HPPTNCPP prevalence: 28.6%. Etiological factors: vitamin D deficiency: 75%; bone remineralization: 16.7%; renal failure: 16.7%; hypercalciruria: 8.3%. No change in the set point of calcium-mediated parathormone (PTH) secretion was observed, but an increase in the preoperative PTH/albumin-corrected calcium (ACC) ratio was observed. Predictive markers: PTH/ACC ratio (AUC 0.947; sensitivity 100%, specificity 78.9%) and PTH (AUC 0.914; sensitivity 100%, specificity 73.7%) one week postparathyroidectomy. EVOLUTION: follow-up 30 ±â€¯16.3 months: 50% normalized PTH and 8.3% had recurrence of hyperparathyroidism. Patients with PPNCHPPT less frequently received preoperative treatment with bisphosphonates and postoperative treatment with calcium salts. CONCLUSIONS: This is the first study in our country that demonstrates a mean prevalence of PPNCHPPT, mainly related to a vitamin D deficiency and a probable resistance to the action of PTH, which can be predicted by the PTH/ACC ratio and PTH a week post-intervention and often evolves normalizing the PTH. We disagree with the etiological effect of hypercalciuria and the change in the PTH/calcemia regulation set point, and we acknowledge the scant treatment administered with calcium salts in the postoperative period.

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Introducción: La tomografía computarizada en cuatro dimensiones (TC-4D) ofrece buena sensibilidad para localizar la glándula patológica responsable del hiperparatiroidismo primario. El objetivo fue evaluar su rendimiento como estudio de segunda línea tras ausencia de localización o resultado no concordante de los estudios habituales. Material y métodos: Estudio observacional retrospectivo que incluyó todos los pacientes intervenidos por hiperparatiroidismo primario con TC-4D como estudio preoperatorio, del 1 de octubre de 2016 al 1 de octubre de 2021, en un centro hospitalario de tercer nivel. Se compararon los resultados de la TC-4D, la ecografía y las exploraciones de medicina nuclear (gammagrafía, SPECT y SPECT-TC) con el gold standard de la exploración quirúrgica y el resultado anatomopatológico, analizando los porcentajes de lateralización correcta y localización aproximada de la glándula patológica. Resultados: El análisis incluyó 64 pacientes, con una curación del 93,8% (60/64). La TC-4D mostró una lateralización correcta del 57,8% (37/64) y reveló la localización aproximada de la glándula en el 48,4% (31/64). La ecografía tuvo unos porcentajes del 31,1% (19/61) y del 18% (11/61) para la lateralización correcta y la localización aproximada, respectivamente, vs. un 34,9% (22/63) y un 28,6% (18/63) de los estudios de medicina nuclear y un 32,7% (16/49) y un 24,5% (12/49) de la SPECT-TC. Estas diferencias fueron estadísticamente significativas. Conclusiones: La TC-4D ofrece un rendimiento aceptable para localizar las lesiones responsables del hiperparatiroidismo primario, por lo que debería considerarse su uso ante la ausencia de localización en los estudios habituales. (AU)

Introduction: Four-dimensional computerized tomography (4D-CT) offers a good sensitivity for the localization of the pathological gland responsible of primary hyperparathyroidism. The aim was to evaluate its results as a second line preoperative localization test after inconclusive or discordant results of usual preoperative studies. Material and methods: Observational retrospective study that included all patients intervened for primary hyperparathyroidism with 4D-CT scan as preoperative study, from 1st October 2016 to 1st October 2021, in a tertiary referral centre. The results of 4D-CT, cervical ultrasound, and nuclear medicine explorations (scintigraphy, SPECT and SPECT-CT) were compared with the gold standard of the surgical exploration and the pathological result. The correct lateralization and the approximate localization rates of the pathological gland were evaluated. Results: A total of 64 patients were analysed, with a 93,8% (60/64) remission rate. 4D-CT showed a correct lateralization in 57,8% (37/64) of the cases and revealed the approximate localization of the gland in 48,4% (31/64) of the cases. The cervical ultrasound had a rate of 31,1% (19/61) and 18% (11/61) for the correct lateralization and approximate localization, respectively, compared to 34,9% (22/63) and 28,6% (18/63) in nuclear medicine explorations, and 32,7% (16/49) and 24,5% (12/49) in SPECT-CT. These differences were statistically significant. Conclusion: 4D-CT demonstrated acceptable results for the localization of the lesions responsible of primary hyperparathyroidism, thus its use should be considered with the absence of localization in routinely studies. (AU)

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Abstract Brown tumors represent the terminal stage of bone remodeling processes in primary hyperparathyroidism. Currently they are rare, and typically affect long bones, pelvis and ribs. Brown tumors may be not included in the initial differential diagnosis of bone disease, espe cially when they are present in atypical localizations. We reported two cases of oral brown tumors as the initial presentation of primary hyperparathyroidism. In the first case, a 44-year-old woman presented a painful and sessile lesion of 4x3 cm over the central body of the mandible which progressively increased in 4-month. The second case involved a 23-year-old woman who was referred with a 3-month history of a painful and ulcerated mass of 2 cm arising from left maxilla, episodes of gingival hemorrhage and difficulty of breathing. Both cases were solitary tumors with no evidence of palpable cervical lymphadenopathy. Incisional biopsy of oral tumors resul ted in giant cell and primary hyperparathyroidism was confirmed by laboratory tests. After parathyroidectomy, histology confirmed adenoma in both cases. Although this type of clinical presentation has almost disappeared in the recent decades, brown tumors should be consi dered in the differential diagnosis of bone oral masses.

Resumen Los tumores pardos son raros y, por lo general, afectan huesos largos, pelvis y costillas. Pueden no estar incluidos en el diagnóstico diferencial inicial como manifestación de enfermedad esquelética, es pecialmente cuando se presentan en localizaciones atípicas. Comunicamos dos casos de tumores pardos orales como presentación inicial de hiperparatiroidismo primario. En el primer caso, una mujer de 44 años presentó una lesión dolorosa y sésil de 4 × 3 cm sobre el cuerpo central de la mandíbula que aumentó de tamaño progresivamente en 4 meses. El segundo caso corresponde a una mujer de 23 años que acudió por presentar una masa dolorosa y ul cerada de 2 cm en maxilar izquierdo de 3 meses de evolución, episodios de hemorragia gingival y difi cultad para respirar. Todos fueron tumores solitarios sin evidencia de linfadenopatía cervical palpable. La biopsia incisional de los tumores orales resultó en células gigantes, y las pruebas de laboratorio confirmaron el hiperparatiroidismo primario. Tras la paratiroidectomía, la histología confirmó adenoma en ambos casos. Los tumores pardos representan la etapa terminal de los procesos de remodelación ósea en el hiperparatiroidismo primario. Aunque este tipo de presentación clínica casi ha desaparecido en las últimas décadas, los tumores pardos deben ser considerados en el diagnóstico diferencial de las masas óseas orales.

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Introducción: el calcio es el electrolito más abundante del cuerpo humano y la hipercalcemia es el trastorno común causado normalmente por el hiperparatiroidismo primario o malignidad, su manejo depende de la presentación y causa subyacente. Además, una proporción de casos se presentan como una emergencia, lo que conlleva a una mortalidad significativa. Objetivo: mostrar un caso inusual de presentación clínica de hipercalcemia asociada a hiperparatiroidismo primario y, asimismo, dar una breve revisión acerca del enfoque y el manejo de esta patología. Presentación del caso: paciente femenina de 32 años, antecedente de adenoma paratiroideo no resecado y pancreatitis, asiste por tres días de dolor abdominal de tipo cólico y de moderada intensidad, acompañado de episodios eméticos de contenido alimentario, paraclínicos iniciales con hipercalcemia severa, electrocardiograma con bloqueo auriculoventricular grado I, gases arteriales con alcalosis respiratoria aguda e hiperlactatemia. También se le practicó un TAC de abdomen donde este apareció con tumores pardos. Se ingresó a la UCI para la administración de líquidos endovenosos, diuréticos de asa y cinacalcet, pero no presentó mejoría, por lo que se indicó terapia de hemodiálisis. Discusión y conclusión: la hipercalcemia es un hallazgo frecuente. El hiperparatiroidismo primario y la neoplasia maligna son las dos causas más frecuentes de aumento de los niveles de calcio sérico y, en conjunto, representan alrededor del 90 % de todos los casos, donde los valores en suero varían entre el calcio total (8,5 y 10,5 mg/dl) y el iónico (1,16-1,31). La concentración sérica de Ca 2+ está estrechamente relacionada por las acciones de la hormona paratiroidea y el calcitriol, donde el hiperparatiroidismo primario ocurre como resultado de adenomas, hiperplasias y carcinoma. Las manifestaciones clínicas y la severidad van a estar correlacionadas con el tiempo de duración de la enfermedad, los niveles de calcio y de PTH. Dentro del tratamiento, este será guiado por su causa, sin embargo, es posible clasificarlo en tratamiento urgente y no urgente. Además, el enfoque de la hipercalcemia aguda severa es un reto diagnóstico dadas las múltiples causas que pueden llevar a este trastorno hidroelectrolítico y la rápida instauración de tratamiento que se requiere cuando es detectada.

Background: Calcium is the most abundant electrolyte in the human body, hypercalcemia is a common disorder usually caused by primary hyperparathyroidism or malignancy. A proportion of cases presenting as an emergency, leading to significant mortality. The management of hypercalcemia depends on the presentation and underlying cause. Purpose: to present an unusual case of clinical presentation of hypercalcemia associated with primary hyperparathyroidism, as well as to give a brief review about the approach and management of this pathology. Case presentation: A 32-year-old female patient, with a history of unresected parathyroid adenoma and pancreatitis, attended for 3 days of abdominal pain, moderate intensity, accompanied by emetic episodes of food content, initial paraclinical findings showed severe hypercalcemia, electrocardiogram with block grade I atrioventricular, arterial gases with acute respiratory alkalosis and hyperlactatemia. CT of the abdomen with brown tumors. She was admitted to the ICU for administration of intravenous fluids, loop diuretics, and cinacalcet without showing any improvement, so hemodialysis therapy was indicated. Discussion and conclusion: hypercalcemia is a frequent finding. Primary hyperparathyroidism and malignancy are the two most common causes of elevated serum calcium levels, together accounting for about 90 % of all cases. Serum values vary between total calcium 8.5 and 10.5 mg/dl and ionic 1.16- 1.31. Serum Ca 2+ concentration is closely related by the actions of parathyroid hormone and calcitriol. Primary hyperparathyroidism occurs as a result of adenomas, hyperplasias, or carcinoma. The clinical manifestations and severity will be correlated with the duration of the disease, calcium and PTH levels. Within the treatment, this will be guided by its cause, however, it is possible to classify it into urgent and non-urgent treatment. The approach to severe acute hypercalcemia is a diagnostic challenge given the multiple causes that can lead to this hydroelectrolyte disorder and the rapid establishment of treatment that is required when it is detected.

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PURPOSE: Selective parathyroidectomy, the treatment of choice for primary hyperparathyroidism, requires precise preoperative localization. Our purpose was to compare the accuracy and concordance of pre-surgical MIBI parathyroid scintigraphy and ultrasonography, as well as to assess the relevance of hybrid acquisition (SPECT/CT) in compromised circumstances: low-weight or ectopic adenomas, coexisting thyroid disease and re-interventions. METHODS: The study included 223 patients with primary hyperparathyroidism operated in a single Surgical Unit from August 2016 to March 2021. Preoperative ultrasonography and double-phase MIBI were performed with early SPECT/CT acquisition. A minimally invasive surgical approach was initially attempted, except in patients with concomitant thyroid surgery or multiglandular parathyroid disease. RESULTS: Selective parathyroidectomy was accomplished in 179 patients (80.2%); cervicotomy and/or thoracoscopy in 44. Removal of the parathyroid lesion was achieved in 211 patients (94.6%), corresponding 204 (96.7%) to adenomas (37 ectopic). The cure rate was 94.2%. Preoperative MIBI SPECT/CT showed higher sensitivity and accuracy (84%; 80%) compared to ultrasound (72%; 71%), being more precise in defining the exact anatomical location (75.8% vs 68.7%). These differences reached statistical significance in ectopic glands. The existence of concomitant thyroid pathology did not decrease the sensitivity of SPECT/CT (84.2%). Mean parathyroid weight was 692.2mg (95%CI: 443.5-941) in MIBI-negative cases and 1145.9mg (95%CI: 983.6-1308.3) in MIBI-positive (p=0.001). Re-intervention was successful in the 8 patients with previous surgery. CONCLUSION: MIBI SPECT/CT presents greater sensitivity, accuracy and anatomical precision than ultrasound for preoperative parathyroid localization, even in the case of ectopic glands or coexisting thyroid pathology. The weight of the pathological gland is a significantly limiting factor.

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Introdução: Hiperparatireoidismo caracteriza-se pelo aumento dos níveis de paratormônio no sangue, hormônio produzido pelas glândulas paratireoides e que tem como função estimular a liberação de cálcio para o plasma sanguíneo. A doença pode ser primária ou secundária. Objetivos: Verificar a prevalência das causas do hiperparatireoidismo em pacientes com hiperplasia ou adenoma de paratireoides; correlacionar os achados cintilográficos aos achados cirúrgicos; identificar e analisar a localização das paratireoides mais acometidas, relacionadas ao sexo e a idade; observar a prevalência de exames anatomopatológicos e apresentar a contribuição da utilização do gama probe no ato cirúrgico. Métodos: Estudo observacional transversal retrospectivo, baseado em dados contidos em prontuários. A amostra foi composta por 142 indivíduos de ambos os sexos, que realizaram cintilografia das paratireoides entre 2015 e 2021. Também foram analisadas as características inerentes aos pacientes, assim como os achados cintilográficos e cirúrgicos. Resultados: Do total de 142 pacientes, 43,7% (n=62) apresentaram achados cintilográficos sugestivos de adenoma ou de hiperplasia de paratireoides, sendo que 27 deles foram submetidos à paratireoidectomia. Destes, 74% eram do sexo feminino e 26% do masculino, com média das idades de 56,9 anos (desvio padrão=14,6). As cintilografias estudadas mostraram comprometimento de apenas uma glândula na maioria dos pacientes (88,9%) e duas glândulas em três deles (11,1%). A localização mais frequentemente acometida foi nas glândulas inferiores, sobretudo as inferiores direitas. Sobre a análise anatomopatológica, 36,4% dos casos foram adenoma e 63,6% hiperplasia, não tendo sido observadas grandes diferenças na idade desses dois grupos. Além disso, não houve relação entre localização e sexo com a presença de Adenoma ou Hiperplasia. Por fim, em 78% das cirurgias o dispositivo gama probe foi utilizado no intraoperatório. Conclusão: O hiperparatireoidismo primário ocorre predominantemente em mulheres, entre 50-60 anos, com acometimento mais frequente em apenas uma das glândulas. As etiologias mais observadas são adenomas ou hiperplasias e o detector Gama-Probe é bastante importante no auxílio cirúrgico

Introduction: Hyperparathyroidism is characterized by increased levels of parathyroid hormone in the blood, a hormone produced by the parathyroid glands and whose function is to stimulate the release of calcium into the blood plasma. The disease may be primary or secondary. Objectives: To verify the prevalence of the causes of hyperparathyroidism in patients with hyperplasia or parathyroid adenoma; to correlate scintigraphic findings with surgical findings; to identify and analyze the location of the most affected parathyroids, related to sex and age; to observe the prevalence of anatomopathological examinations and to present the contribution of the use of the Probe gamma in the surgical act. Methods: Retrospective observational cross sectional study based on data contained in medical records. The sample consisted of 142 individuals of both sexes, who underwent parathyroid scintigraphy between 2015 and 2021. The characteristics inherent to the patients were also analyzed, as well as the scintigraphic and surgical findings. Results: Of the 142 patients, 43.7% (n=62) presented scintigraphic findings suggestive of adenoma or hyperplasia of parathyroid glands, and 27 of them were submitted to parathyroidectomy. Of these, 74% were female and 26% male, with a mean age of 56.9 years (standard deviation = 14.6). The scintigraphies studied showed impairment of only one gland in most patients (88.9%) and two glands in three of them (11.1%). The most frequently affected location was in the lower glands, especially the right lower glands. Regarding the anatomopathological analysis, 36.4% of the cases were adenoma and 63.6% hyperplasia, and no significant differences were observed in the age of these two groups. In addition, there was no relationship between location and sex with the presence of adenoma or hyperplasia. Finally, in 78% of the surgeries the gamma Probe device was used intraoperatively. Conclusion: Primary hyperparathyroidism occurs predominantly in women, aged 50-60 years, with more frequent involvement in only one of the glands. The most observed etiologies are adenomas or hyperplasias and the Gamma-Probe detector is very important in surgical aid

Introducción: El hiperparatiroidismo se caracteriza por el aumento de los niveles de hormona paratiroidea en sangre, hormona producida por las glándulas paratiroides y cuya función es estimular la liberación de calcio al plasma sanguíneo. La enfermedad puede ser primaria o secundaria. Objetivos: Verificar la prevalencia de causas de hiperparatiroidismo en pacientes con hiperplasia o adenoma paratiroideo; correlacionar los hallazgos gammagráficos con los hallazgos quirúrgicos; identificar y analizar la ubicación de las paratiroides más afectadas, en relación con el sexo y la edad; observar la prevalencia de los exámenes anatomopatológicos y presentar la contribución del uso de la sonda gamma en el acto quirúrgico. Métodos: Estudio observacional transversal retrospectivo, basado en datos contenidos en historias clínicas. La muestra estuvo conformada por 142 individuos de ambos sexos, a quienes se les realizó gammagrafía de paratiroides entre 2015 y 2021. También se analizaron las características propias de los pacientes, así como los hallazgos gammagráficos y quirúrgicos. Resultados: Del total de 142 pacientes, el 43,7% (n=62) presentó hallazgos gammagráficos sugestivos de adenoma o hiperplasia paratiroidea, y 27 de ellos fueron sometidos a paratiroidectomía. De estos, el 74% eran mujeres y el 26% hombres, con una edad media de 56,9 años (desviación estándar = 14,6). La gammagrafía estudiada mostró afectación de una sola glándula en la mayoría de los pacientes (88,9%) y de dos glándulas en tres de ellos (11,1%). La localización más frecuentemente afectada fueron las glándulas inferiores, especialmente las inferiores derechas. En cuanto al análisis anatomopatológico, el 36,4% de los casos fueron adenoma y el 63,6% hiperplasia, no observándose grandes diferencias en la edad de estos dos grupos. Además, no hubo relación entre la localización y el sexo con la presencia de adenoma o hiperplasia. Finalmente, en el 78% de las cirugías se utilizó intraoperatoriamente el dispositivo de sonda gamma. Conclusión: El hiperparatiroidismo primario se presenta predominantemente en mujeres, con edades entre 50-60 años, siendo más frecuente la afectación de una sola de las glándulas. Las etiologías más observadas son adenomas o hiperplasias y el detector Gamma-Probe es muy importante en la asistencia quirúrgica

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La paratiroidectomía mínimamente invasiva, de elección en la mayoría de casos de hiperparatiroidismo primario, muestra una elevada tasa de detección, fundamentada en una precisa localización preoperatoria mediante gammagrafía con MIBI (SPECT/TC) y ecografía cervical. La paratiroidectomía mínimamente invasiva radioguiada es una técnica aún más efectiva, acorta los tiempos quirúrgicos y mantiene una mínima incisión y escasas complicaciones; permite además la comprobación inmediata de la exéresis de la lesión paratiroidea y es especialmente interesante en pacientes con adenomas ectópicos o antecedentes quirúrgicos cervicales. En el presente trabajo se exponen las indicaciones, los protocolos y las diferencias entre los dos procedimientos disponibles de cirugía radioguiada mínimamente invasiva de paratiroides (MIBI y ROLL). (AU)

Minimally invasive parathyroidectomy, of choice in most cases of primary hyperparathyroidism, shows a high detection rate, based on precise preoperative localization by MIBI scintigraphy (SPECT/CT) and neck ultrasound. Radio-guided minimally invasive parathyroidectomy is an even more effective technique, which shortens surgical times, maintains minimal incision and few complications, allows immediate verification of parathyroid adenoma removal and is especially interesting in patients with ectopic lesions or cervical surgical history. In this paper, the indications, protocols and differences between the two available radio-guided parathyroid surgery procedures (MIBI and ROLL) are exposed. (AU)

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BACKGROUND: It has been suggested that vitamin D deficiency is associated with worse clinical outcomes in primary hyperparathyroidism (PHPT). We aimed to evaluate the relationship between vitamin D deficiency and clinical, biochemical and metabolic parameters in PHPT patients. METHODS: A total of 128 patients with biochemically confirmed PHPT were included. Patients were categorized as vitamin D deficient if 25-OH vitamin D was <50nmol/L, or normal if vitamin D was ≥50nmol/L. Biochemical parameters, bone mineral densitometry (BMD), and urinary tract and neck ultrasonography were assessed. RESULTS: In the study group, 66 (51.6%) patients had vitamin D deficiency and 60 (48.4%) had normal vitamin D levels. Nephrolithiasis and osteoporosis were found in 26.6% and 30.5% of subjects, respectively. The prevalence of metabolic syndrome (MetS), obesity (BMI≥30kg/m2) and hypertension (HTN) were higher in the vitamin D deficient group when compared to the normal group (p=0.04, p=0.01 and p=0.03, respectively). There was no difference regarding the presence of nephrolithiasis and osteoporosis between the groups. The mean adenoma size was similar in both groups. CONCLUSIONS: Vitamin D deficiency was not associated with osteoporosis, nephrolithiasis, adenoma size or biochemical parameters in PHPT. However, vitamin D deficiency may be a risk factor for developing HTN and MetS in PHPT.

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Minimally invasive parathyroidectomy, of choice in most cases of primary hyperparathyroidism, shows a high detection rate, based on precise preoperative localization by MIBI scintigraphy (SPECT/CT) and neck ultrasound. Radioguided minimally invasive parathyroidectomy is an even more effective technique, which shortens surgical times, maintains minimal incision and few complications, allows immediate verification of parathyroid adenoma removal and is especially interesting in patients with ectopic lesions or cervical surgical history. In this paper, the indications, protocols and differences between the two available radioguided parathyroid surgery procedures (MIBI and R.O.L.L.) are exposed.

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INTRODUCTION: Four-dimensional computerized tomography (4D-CT) offers a good sensitivity for the localization of the pathological gland responsible of primary hyperparathyroidism. The aim was to evaluate its results as a second line preoperative localization test after inconclusive or discordant results of usual preoperative studies. MATERIAL AND METHODS: Observational retrospective study that included all patients intervened for primary hyperparathyroidism with 4D-CT scan as preoperative study, from 1st October 2016 to 1st October 2021, in a tertiary referral centre. The results of 4D-CT, cervical ultrasound, and Nuclear Medicine explorations (scintigraphy, SPECT and SPECT-CT) were compared with the gold standard of the surgical exploration and the pathological result. The correct lateralization and the approximate localization rates of the pathological gland were evaluated. RESULTS: A total of 64 patients were analysed, with a 93,8% (60/64) remission rate. 4DCT showed a correct lateralization in 57,8% (37/64) of the cases and revealed the approximate localization of the gland in 48,4% (31/64) of the cases. The cervical ultrasound had a rate of 31,1% (19/61) and 18% (11/61) for the correct lateralization and approximate localization, respectively, compared to 34,9% (22/63) and 28,6% (18/63) in Nuclear Medicine explorations, and 32,7% (16/49) and 24,5% (12/49) in SPECT-CT. These differences were statistically significant. CONCLUSION: 4D-CT demonstrated acceptable results for the localization of the lesions responsible of primary hyperparathyroidism, thus its use should be considered with the absence of localization in routinely studies.

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OBJECTIVE: There are few studies evaluating the effect of high body mass index (BMI) on parathyroid surgery. The aim of this study was to examine the relationship between the BMI and post-operative outcome of the patients who were operated for primary hyperparathyroidism (PHP). MATERIAL AND METHODS: Hospital files of patients who were operated for PHP between January 2013 and January 2020 were reviewed retrospectively. Patients operated by surgeons experienced in endocrine surgery (more than 25 cases/year) were included in the study. Patients were divided into two groups according to BMI (Group 1 < and Group 2 ≥ 25). Data were analyzed. RESULTS: Groups were similar in terms of age (p = 0.715) and sex (p = 0.253). There was no significant difference between groups regarding postoperative hospital stay (p = 0.561), rate of transient hypocalcemia (p = 0.748), or permanent hypocalcemia (p = 0.530). The mean operative time was shorter in Group 1 (84 min in Group 1 and 70 min in Group 2, p = 0.045). CONCLUSION: Parathyroid surgery can safely be performed in patients with high BMI by surgeons experienced in endocrine surgery.

OBJETIVOS: Existen pocos estudios evaluando el efecto de un alto índice de masa corporal (IMC) en la cirugía de paratiroides. El objetivo de este estudio fue examinar la relación entre el índice de masa corporal (IMC) y el resultado posoperatorio depacientes que fueron operados por hiperparatiroidismo primario (PHP). MATERIAL Y MÉTODOS: Expedientes de pacientes que fueron operados por PHP entre enero de 2013 y enero de 2020 fueron revisados retrospectivamente. Pacientes operados por ciruganoscon experiencia en cirugía endocrina (más de 25 casos por año) fueron incluidos. Los pacientes fueron divididos en dos grupos de acuerdo a IMC (grupo 1 < 25 y grupo 2 ≥ 25). Los datos fueron analizados. RESULTADOS: Los grupos eran similares en cuanto a edad (p = 0.715) y sexo (p = 0.253). No hubo diferencia significativa entre los grupos en relación con la permanencia hospitalaria posoperatoria (p = 0.561), taza de hipocalcemia transitoria (p = 0.748) ohipocalcemia permanente (p = 0.530). La media de tiempo de operación fue menor en el grupo 1 (84 minutos en el grupo 1 y 70 minutos en el grupo 2, p = 0.045). CONCLUSIÓN: La cirugía de paratiroides puede ser realizada con seguridad en pacientes con alto IMC por ciruganos con experiencia en cirugía endocrina.

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Introducción El hiperparatiroidismo primario es la tercera enfermedad endócrina más frecuente. El objetivo de este estudio fue determinar los resultados a largo plazo y los factores de riesgo de persistencia en pacientes operados por hiperparatiroidismo primario. Métodos Estudio retrospectivo de pacientes operados de paratiroidectomía entre 2009-2019. Se definió cura como el restablecimiento de la homeostasis normal del calcio durante un mínimo de seis meses, persistencia como la continuidad de hipercalcemia por más de seis meses postoperatorios, y recurrencia como la reaparición de hipercalcemia luego de un intervalo normocalcémico mayor a seis meses postoperatorios. Se realizó un análisis más detallado en pacientes con normocalcemia y hormona paratiroidea (HPT) elevada postoperatoria. Las variables independientemente relacionadas a persistencia fueron analizadas mediante análisis multivariante. Resultados Se incluyeron 212 pacientes. La edad media fue 59 años y 83% fueron mujeres. Se observó cura en 204 pacientes (96,2%), persistencia en ocho (3,8%) y recurrencia en tres (1,4%). Cuatro pacientes (1,9%) presentaron normocalcemia y HPT persistentemente elevada luego de la cirugía. Todos presentaron patología paratiroidea (dos adenoma y dos hiperplasia). En el seguimiento se observaron tres pacientes con fallo renal crónico (FRC) y uno con déficit de vitamina D. La persistencia se asoció independientemente con hiperplasia (Odds ratio=12,6; IC 95%: 1,28-124; p = 0,030) y tejido paratiroideo normal (Odds ratio=188; IC 95%: 9,33- 379; p = 0,001) en el estudio histopatológico. Conclusión La paratiroidectomía es un procedimiento seguro en términos de morbilidad y resultados a largo plazo. La hiperplasia y el tejido paratiroideo normal en el estudio histopatológico son factores de riesgo de persistencia (AU)

Introduction Primary hyperparathyroidism is the third most common endocrine disease. The aim of our study was to determine long-term outcomes and risk factors for persistence in patients undergoing parathyroidectomy for primary hyperparathyroidism. Methods Retrospective study including patients undergoing parathyroidectomy between 2009- 2019. Cure was defined as reestablishment of normal calcium homeostasis lasting a minimum of 6 months. Persistence was defined by ongoing hypercalcemia more than 6 months after surgery. Recurrent PHTP was defined by recurrence of hypercalcemia after a normocalcemic interval at more than 6 months after surgery. A more detailed analysis was performed on patients with normocalcemia and persistently elevated PTH levels after surgery. Variables independently related to persistence were analyzed by multivariate analysis. Results We included 212 patients. Mean age was 59 years and 83% were women. Cure was observed in 204 patients (96.2%), persistence in 8 (3.8%) and recurrence in 3 (1.4%). Four patients (1.9%) presented normocalcemia and persistently elevated PTH after surgery. All presented parathyroid pathology (2 adenomas and 2 hyperplasia). In follow-up we observed that adenoma subgroup presented one patient with CKD and one with vitamin D deficiency while in the hyperplasia subgroup two patients presented CKD. Persistence was independently associated with hyperplasia (Odds ratio=12.6, IC95%=1.28-124, p=0.030) and normal parathyroid tissue (Odds ratio=188, IC95%=9.33-379, p=0.001) on histopathological report. Conclusión Primary hyperparathyroidism is a safe procedure in terms of morbidity and long-term outcomes. Hyperplasia and normal parathyroid tissue on histopathological report are risk factors for persistence. An interdisciplinary diagnostic and therapeutic approach is required to prevent persistence (AU)

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OBJECTIVE: Voice quality disorders remain a problem with classical surgical method which is expected to decrease with new minimally invasive methods. We aimed to examine whether there is an impairment in voice quality among our patients who have undergone open minimally invasive parathyroid surgery. METHODS: Forty-seven primer hyperparathyroidism patients included in the study. Their video laryngoscopic evaluations and voice analyses were done in pre-operative and post-operative 6th month, and changes in the voice quality were examined. RESULTS: Eighty-five (85.1%) of patients were female, with a mean age of 51.5 ± 9.4. According to the voice analysis in the preoperative-postoperative 6th months, F0 (%): 210.616-211.443, Jitt (%): 0.699-0.735, RAP (%): 0.420-0.444, Shim (%): 2.535-2.736, NHR (dB): 0.119-0.123, and VTI: 0.044-0.045, respectively. No significant differences were observed in any of the acoustic parameters between the pre- and post-operative periods. CONCLUSION: No deterioration in voice quality was observed in patients undergoing novel minimally invasive surgical technique. In this respect we think that this new method will be much more advantageous in terms of preserving the voice quality in eligible patients.

OBJECTIVO: Los trastornos de la calidad de la voz siguen siendo un problema con el método quirúrgico clásico y se espera que disminuyan con los nuevos métodos mínimamente invasivos. Nuestro objetivo fue examinar si existe un deterioro en la calidad de la voz entre nuestros pacientes que se han sometido a una cirugía abierta de paratiroides mínimamente invasiva. MÉTODOS: Se incluyeron en el estudio 47 pacientes con hiperparatiroidismo primario. Sus evaluaciones videolaringoscópicas y análisis de voz se realizaron en el sexto mes preoperatorio y posoperatorio, y se examinaron los cambios en la calidad de la voz. RESULTADOS: Ochenta y cinco (85,1%) de los pacientes eran mujeres, con una edad media de 51,5 ± 9,4. Según el análisis de voz en el sexto mes preoperatorio-posoperatorio, F0 (%): 210.616-211.443, Jitt (%): 0.699-0.735, RAP (%): 0.420-0.444, Shim (%): 2.535-2.736, NHR (dB): 0,119-0,123 y VTI: 0,044-0,045 respectivamente. No se observaron diferencias significativas en ninguno de los parámetros acústicos entre el pre y postoperatorio. CONCLUSIÓN: No se observó deterioro en la calidad de la voz en pacientes sometidos a una técnica quirúrgica mínimamente invasiva novedosa. Teniendo en cuenta que este método brindará la oportunidad de preservar la calidad de la voz en pacientes elegibles.

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OBJECTIVE: To provide practical recommendations for the management of mineral and bone metabolism alterations in pregnancy and lactation. PARTICIPANTS: Members of the Working Group on Osteoporosis and Mineral Metabolism of the Spanish Society of Endocrinology and Nutrition. METHODS: Recommendations were formulated according to the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) system to describe both the strength of recommendations and the quality of evidence. A systematic search was carried out in Medline of the available evidence for each pathology. Papers in English with publication date until 29 February 2020 were included. A methodologist resolved the differences that arose during the process of reviewing the literature and formulating recommendations. The recommendations were discussed and approved by all members of the Working Group. CONCLUSIONS: The document establishes practical recommendations based on evidence about the management of mineral and bone metabolism disorders in pregnancy and lactation.

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Introducción y objetivo: Una vez realizado el diagnóstico de hiperparatiroidismo primario (HPTp), el único tratamiento curativo posible es la paratiroidectomía. Puede llevarse a cabo mediante una exploración cervical bilateral o por medio de una paratiroidectomía mínimamente invasiva (MIP), en la que exclusivamente se explora el compartimento cervical en el que se encuentra la glándula paratiroides sospechosa de causar el HPTp. Los resultados de ambas técnicas son comparables, existiendo una mayor tendencia a realizar MIP cuando en las pruebas de localización de imagen se localiza correctamente la glándula afecta. En el caso de que las pruebas de localización resulten negativas o discordantes el tipo de abordaje quirúrgico es controvertido. Método: Se realizó una revisión sistemática de artículos originales, guías, y documentos de sociedades científicas dedicadas al manejo del hiperparatiroidismo primario que incluían casos con pruebas de localización contradictorias o negativas. Se localizaron 211 estudios y finalmente se seleccionaron 2 revisiones sistemáticas, 20 estudios originales y 4 guías de recomendaciones de sociedades profesionales.Discusión: La recomendación formal de las guías es realizar una BNE en los casos de pruebas de localización negativa. En el resto de la literatura revisada se observó una tendencia creciente de los cirujanos a solicitar pruebas de localización complementarias para intentar una MIP, aunque la mayoría seguían la recomendación de las guías. Algunos autores han reportado tasas de éxito de MIP con medición intraoperatoria de PTH similares a los obtenidos con BNE. Técnicas como el PET-TC con 18F-fluorocolina o 11C-colina, la cirugía radioguiada con gammacámara y la medición intraoperatoria de PTH, son de especial utilidad en el estudio prequirúrgico y como apoyo durante la cirugía de casos con pruebas de localización negativas. (AU)

Introduction and objective: Once the diagnosis of primary hyperparathyroidism (pHPT) is made, the only curative treatment available is parathyroidectomy. This can be achieved by a bilateral neck exploration or through a minimally invasive parathyroidectomy, in which the only neck compartment explored is the one suspected of having the parathyroid gland causing the pHPT. The results of both techniques are equivalent. However, there is a growing tendency to choose MIP when imaging studies correctly localize the affected gland. When imaging studies are negative or discordant, surgical management causes some controversies. Method: We performed a systematic review of original articles, guidelines and scientific socie-ties documents related to the management of primary hyperparathyroidism with contradictory or negative preoperative localization. We found 211 studies, and selected 2 systematic reviews, 20 original articles and 4 guidelines. Discussion: Guidelines recommend performing a BNE when preoperative localization fails. In the reviewed literature we observed a growing tendency of requesting further imaging studies to perform a MIP, although the majority of surgeons follow the guidelines. MIP + intraoperative PTH monitoring has been reported to have similar success rates as BNE. Some techniques like 18F-Fluorocloline or 11C-coline PET-TC, radioguided surgery with intraoperative gamma camera and intraoperative PTH monitoring, are especially useful in the preoperative workup and as support during surgery when localizing imaging tests result negative. (AU)

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