RESUMO

The coronavirus disease (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has spread exponentially worldwide. In Brazil, the number of infected people diagnosed has been increasing and, as in other countries, it has been associated with a high risk of contamination in healthcare teams. For healthcare professionals, the full use of personal protective equipment (PPE) is mandatory, such as wearing surgical or filtering facepiece class 2 (FFP2) masks, waterproof aprons, gloves, and goggles, in addition to training in care processes. A reduction in the number of face-to-face visits and non-essential elective procedures is also recommended. However, surgery should not be postponed in the case of the most essential elective indications (mostly associated with head and neck cancers). As malignant tumors of the head and neck are clinically time sensitive, neither consultations for these tumors nor their treatment should be postponed. Postponing surgical treatment can result in a change in the disease stage and alter an individual's chance of survival. In this situation, planning of all treatments must begin with the request for, in addition to routine examinations, a nasal swab polymerase chain reaction for SARS-CoV-2 and chest computed tomography. Only if the results of these tests are positive or if fever or other symptoms suggestive of COVID-19 are present should the surgical procedure be postponed until the patient completely recovers. This is mandatory not only because of the risk of contamination of the surgical team but also because of the increased risk of postoperative complications and high risk of death. During this pandemic, the most effective safety measures are social distancing for the general public and the adequate availability and use of PPE in the healthcare field. The treatment of other chronic diseases, such as cancer, should be continued, as the damming of cases of these diseases will have a deleterious effect on the public healthcare system.

Assuntos

Infecções por Coronavirus/prevenção & controle , Coronavirus , Transmissão de Doença Infecciosa do Paciente para o Profissional/prevenção & controle , Transmissão de Doença Infecciosa do Profissional para o Paciente/prevenção & controle , Pandemias , Segurança do Paciente , Equipamento de Proteção Individual , Pneumonia Viral/prevenção & controle , Guias de Prática Clínica como Assunto , Betacoronavirus , Brasil , COVID-19 , Infecções por Coronavirus/epidemiologia , Humanos , Pneumonia Viral/epidemiologia , Equipamentos de Proteção , SARS-CoV-2 , Cirurgiões

RESUMO

The coronavirus disease (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has spread exponentially worldwide. In Brazil, the number of infected people diagnosed has been increasing and, as in other countries, it has been associated with a high risk of contamination in healthcare teams. For healthcare professionals, the full use of personal protective equipment (PPE) is mandatory, such as wearing surgical or filtering facepiece class 2 (FFP2) masks, waterproof aprons, gloves, and goggles, in addition to training in care processes. A reduction in the number of face-to-face visits and non-essential elective procedures is also recommended. However, surgery should not be postponed in the case of the most essential elective indications (mostly associated with head and neck cancers). As malignant tumors of the head and neck are clinically time sensitive, neither consultations for these tumors nor their treatment should be postponed. Postponing surgical treatment can result in a change in the disease stage and alter an individual's chance of survival. In this situation, planning of all treatments must begin with the request for, in addition to routine examinations, a nasal swab polymerase chain reaction for SARS-CoV-2 and chest computed tomography. Only if the results of these tests are positive or if fever or other symptoms suggestive of COVID-19 are present should the surgical procedure be postponed until the patient completely recovers. This is mandatory not only because of the risk of contamination of the surgical team but also because of the increased risk of postoperative complications and high risk of death. During this pandemic, the most effective safety measures are social distancing for the general public and the adequate availability and use of PPE in the healthcare field. The treatment of other chronic diseases, such as cancer, should be continued, as the damming of cases of these diseases will have a deleterious effect on the public healthcare system.

Assuntos

Humanos , Transmissão de Doença Infecciosa do Profissional para o Paciente/prevenção & controle , Transmissão de Doença Infecciosa do Paciente para o Profissional/prevenção & controle , Infecções por Coronavirus/prevenção & controle , Coronavirus , Pandemias , Segurança do Paciente , Pneumonia Viral/prevenção & controle , Pneumonia Viral/epidemiologia , Equipamentos de Proteção , Brasil , Guias de Prática Clínica como Assunto , Infecções por Coronavirus/epidemiologia , Cirurgiões , Equipamento de Proteção Individual , Betacoronavirus , SARS-CoV-2 , COVID-19

RESUMO

We have systematically studied the single-particle states in quantum rings produced by a set of concentric circular gates over a graphene sheet placed on a substrate. The resulting potential profiles and the interaction between the graphene layer and the substrate are considered within the Dirac Hamiltonian in the framework of the envelope function approximation. Our simulations allow microscopic mapping of the character of the electron and hole quasi-particle solutions according to the applied voltage. General conditions to control and operate the bound state solutions are described as functions of external and controllable parameters that will determine the optical properties ranging from metallic to semiconductor phases. Contrasting behaviors are obtained when comparing the results for repulsive and attractive voltages as well as for variation of the relative strength of the graphene-substrate coupling parameter.

Assuntos

Grafite/química , Grafite/efeitos da radiação , Modelos Químicos , Modelos Moleculares , Nanoestruturas/química , Nanoestruturas/ultraestrutura , Simulação por Computador , Campos Eletromagnéticos , Substâncias Macromoleculares/química , Substâncias Macromoleculares/efeitos da radiação , Teste de Materiais , Conformação Molecular/efeitos da radiação , Nanoestruturas/efeitos da radiação , Tamanho da Partícula , Propriedades de Superfície/efeitos da radiação

RESUMO

We briefly review the surgical approaches to medullary thyroid carcinoma associated with multiple endocrine neoplasia type 2 (medullary thyroid carcinoma/multiple endocrine neoplasia type 2). The recommended surgical approaches are usually based on the age of the affected carrier/patient, tumor staging and the specific rearranged during transfection codon mutation. We have focused mainly on young children with no apparent disease who are carrying a germline rearranged during transfection mutation. Successful management of medullary thyroid carcinoma in these cases depends on early diagnosis and treatment. Total thyroidectomy should be performed before 6 months of age in infants carrying the rearranged during transfection 918 codon mutation, by the age of 3 years in rearranged during transfection 634 mutation carriers, at 5 years of age in carriers with level 3 risk rearranged during transfection mutations, and by the age of 10 years in level 4 risk rearranged during transfection mutations. Patients with thyroid tumor >5 mm detected by ultrasound, and basal calcitonin levels >40 pg/ml, frequently have cervical and upper mediastinal lymph node metastasis. In the latter patients, total thyroidectomy should be complemented by extensive lymph node dissection. Also, we briefly review our data from a large familial medullary thyroid carcinoma genealogy harboring a germline rearranged during transfection Cys620Arg mutation. All 14 screened carriers of the rearranged during transfection Cys620Arg mutation who underwent total thyroidectomy before the age of 12 years presented persistently undetectable serum levels of calcitonin (<2 pg/ml) during the follow-up period of 2-6 years. Although it is recommended that preventive total thyroidectomy in rearranged during transfection codon 620 mutation carriers is performed before the age of 5 years, in this particular family the surgical intervention performed before the age of 12 years led to an apparent biochemical cure.

Assuntos

Carcinoma Medular/cirurgia , Excisão de Linfonodo , Neoplasia Endócrina Múltipla Tipo 2a/cirurgia , Neoplasias da Glândula Tireoide/cirurgia , Calcitonina/sangue , Carcinoma Medular/genética , Carcinoma Neuroendócrino , Criança , Mutação em Linhagem Germinativa/genética , Humanos , Neoplasia Endócrina Múltipla Tipo 2a/genética , Pescoço , Proteínas Proto-Oncogênicas c-ret/genética , Neoplasias da Glândula Tireoide/genética

RESUMO

BACKGROUND: Chyle fistulas may occur after left neck dissections that include level IV, due to injury of the thoracic duct or of 1 of its major branches. Despite being unusual, this complication carries substantial postoperative morbidity and even mortality. So far, no effective intraoperative maneuver has been reported to detect this fistula at the end of a neck dissection. In this cohort study, we sought to describe a simple new maneuver, intraoperative abdominal compression, which can effectively help to identify an open major lymphatic duct on level IV at the end of a neck dissection. PATIENTS AND METHODS: From March 1989 to September 2010, 206 patients underwent neck dissections involving left level IV, and underwent intraoperative abdominal compression. There were 119 men and 87 women, with ages ranging from 18 to 81 years (median, 52 years). One hundred forty-four patients had squamous cell carcinomas, 54 had thyroid carcinomas, 5 had malignant melanomas, and 3 had salivary cancers. Distribution by type of left neck dissection was: selective including levels II, III, and IV (73 cases; 35.4%), selective including levels II, III, IV, and V (55 cases; 26.6%), selective including levels I, II, III, and IV (12 cases; 5.8%), modified radical (47 cases; 22.8%), and radical (19 cases; 9.2%). In all cases, at the end of the procedure, the endotracheal tube was temporarily disconnected from the ventilator. Keeping the dissected level IV area under clear visualization, an abdominal compression was performed. At this moment, any detected lymphatic leak was carefully clamped and tied with nonabsorbable sutures. After ventilating the patient, the intraoperative abdominal compression was repeated to reassure complete occlusion of the lymphatic vessel. RESULTS: In 13 cases (6.3%), a chyle leak was detected after performing the intraoperative abdominal compression. All leaks except for 2 were successfully controlled after 1 attempt. In these 2 patients, a patch of muscle and fat tissue was applied with fibrin glue on the top. In 1 of these patients, another chyle leak in a different location was detected only at the second intraoperative abdominal compression, and was also effectively closed. Postoperatively, there were 2 (1%) chyle fistulas, both among these 13 cases, and all were successfully managed with clinical measures only. No fistulas occurred among the remaining 193 patients in whom intraoperative abdominal compression did not demonstrate lymphatic leak. CONCLUSION: To our knowledge, this is the first description of a specific maneuver to actively detect a lymphatic fistula at the end of a left neck dissection involving level IV. In this study, intraoperative abdominal compression was able to detect an open lymphatic vessel in 6.3% of the cases, as well as to assure its effective sealing in the remaining 93.7% of the patients. Moreover, no life-threatening high-volume fistula was noted in this study.

Assuntos

Fístula/diagnóstico , Esvaziamento Cervical/efeitos adversos , Ducto Torácico/lesões , Abdome , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Quilo , Estudos de Coortes , Feminino , Fístula/etiologia , Fístula/cirurgia , Humanos , Masculino , Pessoa de Meia-Idade , Pressão , Ducto Torácico/cirurgia , Adulto Jovem

RESUMO

We briefly review the surgical approaches to medullary thyroid carcinoma associated with multiple endocrine neoplasia type 2 (medullary thyroid carcinoma/multiple endocrine neoplasia type 2). The recommended surgical approaches are usually based on the age of the affected carrier/patient, tumor staging and the specific rearranged during transfection codon mutation. We have focused mainly on young children with no apparent disease who are carrying a germline rearranged during transfection mutation. Successful management of medullary thyroid carcinoma in these cases depends on early diagnosis and treatment. Total thyroidectomy should be performed before 6 months of age in infants carrying the rearranged during transfection 918 codon mutation, by the age of 3 years in rearranged during transfection 634 mutation carriers, at 5 years of age in carriers with level 3 risk rearranged during transfection mutations, and by the age of 10 years in level 4 risk rearranged during transfection mutations. Patients with thyroid tumor >5 mm detected by ultrasound, and basal calcitonin levels >40 pg/ml, frequently have cervical and upper mediastinal lymph node metastasis. In the latter patients, total thyroidectomy should be complemented by extensive lymph node dissection. Also, we briefly review our data from a large familial medullary thyroid carcinoma genealogy harboring a germline rearranged during transfection Cys620Arg mutation. All 14 screened carriers of the rearranged during transfection Cys620Arg mutation who underwent total thyroidectomy before the age of 12 years presented persistently undetectable serum levels of calcitonin (<2 pg/ml) during the follow-up period of 2-6 years. Although it is recommended that preventive total thyroidectomy in rearranged during transfection codon 620 mutation carriers is performed before the age of 5 years, in this particular family the surgical intervention performed before the age of 12 years led to an apparent biochemical cure.

Assuntos

Criança , Humanos , Carcinoma Medular/cirurgia , Excisão de Linfonodo , /cirurgia , Neoplasias da Glândula Tireoide/cirurgia , Calcitonina/sangue , Carcinoma Medular/genética , Mutação em Linhagem Germinativa/genética , /genética , Pescoço , Proteínas Proto-Oncogênicas c-ret/genética , Neoplasias da Glândula Tireoide/genética

RESUMO

We study the single-particle properties of Dirac Fermions confined to a double quantum wire system based on graphene. We map out the spatial regions where electrons in a given subband display the largest occupation probability induced by spatial anisotropic effects associated to the interaction strength between the graphene wires and the substrate. Here, the graphene-substrate interaction is considered as an ad hoc parameter which destroys the zero-gap observed in the relativistic Dirac cone characteristic of graphene electronic energy dispersions. Furthermore, the results indicate that the character of quasi-extended spin states, viewed by multisubband probability density function, is highly sensitive to spatial asymmetries and to the graphene-substrate interaction strength.

RESUMO

CONTEXT: Previous studies have shown that double RET mutations may be associated with unusual multiple endocrine neoplasia type 2 (MEN 2) phenotypes. OBJECTIVE: Our objective was to report the clinical features of patients harboring a previously unreported double mutation of the RET gene and to characterize this mutation in vitro. PATIENTS: Sixteen patients from four unrelated families and harboring the C634Y/Y791F double RET germline mutation were included in the study. RESULTS: Large pheochromocytomas measuring 6.0-14 cm and weighing up to 640 g were identified in the four index cases. Three of the four tumors were bilateral. High penetrance of pheochromocytoma was also seen in the C634Y/Y791F-mutation-positive relatives (seven of nine, 77.7%). Of these, two cases had bilateral tumors, one presented with multifocal tumors, two cases had large tumors (>5 cm), and one case, which was diagnosed with a large (5.5 x 4.5 x 4.0 cm) pheochromocytoma, reported early onset of symptoms of the disease (14 yr old). The overall penetrance of pheochromocytoma was 84.6% (11 of 13). Development of medullary thyroid carcinoma in our patients seemed similar to that observed in patients with codon 634 mutations. Haplotype analysis demonstrated that the mutation did not arise from a common ancestor. In vitro studies showed the double C634Y/Y791F RET receptor was significantly more phosphorylated than either activated wild-type receptor or single C634Y and Y791F RET mutants. CONCLUSIONS: Our data suggest that the natural history of the novel C634Y/Y791F double mutation carries a codon 634-like pattern of medullary thyroid carcinoma development, is associated with increased susceptibility to unusually large bilateral pheochromocytomas, and is likely more biologically active than each individual mutation.

Assuntos

Neoplasias das Glândulas Suprarrenais/genética , Predisposição Genética para Doença/genética , Neoplasia Endócrina Múltipla Tipo 2a/genética , Mutação/genética , Feocromocitoma/genética , Proteínas Proto-Oncogênicas c-ret/genética , Neoplasias das Glândulas Suprarrenais/metabolismo , Adulto , Western Blotting , Células Cultivadas , Feminino , Estudos de Associação Genética , Testes Genéticos , Haplótipos/genética , Humanos , Pessoa de Meia-Idade , Neoplasia Endócrina Múltipla Tipo 2a/metabolismo , Linhagem , Penetrância , Fenótipo , Feocromocitoma/metabolismo , Proteínas Proto-Oncogênicas c-ret/metabolismo

RESUMO

Hypercalcitoninemia has frequently been reported as a marker for medullary thyroid carcinoma. Currently, calcitonin measurements are mostly useful in the evaluation of tumor size and progression, and as an index of biochemical improvement of medullary thyroid carcinomas. Although measurement of calcitonin is a highly sensitive method for the detection of medullary thyroid carcinoma, it presents a low specificity for this tumor. Several physiologic and pathologic conditions other than medullary thyroid carcinoma have been associated with increased levels of calcitonin. Several cases of thyroid nodules associated with increased values of calcitonin are not medullary thyroid carcinomas, but rather are related to other conditions, such as hypercalcemias, hypergastrinemias, neuroendocrine tumors, renal insufficiency, papillary and follicular thyroid carcinomas, and goiter. Furthermore, prolonged treatment with omeprazole (>2-4 months), beta-blockers, glucocorticoids and potential secretagogues, have been associated with hypercalcitoninemia. An association between calcitonin levels and chronic auto-immune thyroiditis remains controversial. Patients with calcitonin levels >100 pg/mL have a high risk for medullary thyroid carcinoma (approximately 90%-100%), whereas patients with values from 10 to 100 pg/mL (normal values: <8.5 pg/mL for men, <5.0 pg/mL for women; immunochemiluminometric assay) have a <25% risk for medullary thyroid carcinoma.In multiple endocrine neoplasia type 2 (MEN2), RET mutation analysis is the gold-standard for the recommendation of total preventive thyroidectomy to relatives at risk of harboring a germline RET mutation (50%). False-positive calcitonin results within MEN2 families have led to incorrect indications of preventive total thyroidectomy to RET mutation negative relatives. In this review, we focus on the differential diagnosis of hypercalcitoninemia, underlining its importance for the avoidance of misdiagnosis of medullary thyroid carcinoma and consequent incorrect recommendation for thyroid surgery.

Assuntos

Biomarcadores Tumorais/sangue , Calcitonina/sangue , Carcinoma Medular/diagnóstico , Neoplasias da Glândula Tireoide/diagnóstico , Carcinoma Medular/sangue , Carcinoma Medular/cirurgia , Diagnóstico Diferencial , Feminino , Humanos , Masculino , Neoplasia Endócrina Múltipla/sangue , Neoplasia Endócrina Múltipla/diagnóstico , Risco , Neoplasias da Glândula Tireoide/sangue , Neoplasias da Glândula Tireoide/cirurgia , Tireoidectomia

RESUMO

INTRODUCTION: Medullary thyroid carcinoma may occur in a sporadic (s-medullary thyroid carcinoma, 75%) or in a multiple endocrine neoplasia type 2 form (MEN2, 25%). These clinical forms differ in many ways, as s-medullary thyroid carcinoma cases are RET-negative in the germline and are typically diagnosed later than medullary thyroid carcinoma in MEN2 patients. In this study, a set of cases with s-medullary thyroid carcinoma are documented and explored. PURPOSE: To document the phenotypes observed in s-medullary thyroid carcinoma cases from a university group and to attempt to improve earlier diagnosis of s-medullary thyroid carcinoma. Some procedures for diagnostics are also recommended. METHOD: Patients (n=26) with apparent s-medullary thyroid carcinoma were studied. Their clinical data were reviewed and peripheral blood was collected and screened for RET germline mutations. RESULTS: The average age at diagnosis was 43.9 years (+/- 10.82 SD) and did not differ between males and females. Calcitonin levels were increased in all cases. Three patients presented values that were 100-fold greater than the normal upper limit. Most (61.54%) had values that were 20-fold below this limit. Carcinoembryonic antigen levels were high in 70.6% of cases. There was no significant association between age at diagnosis, basal calcitonin levels or time of disease onset with thyroid tumor size (0.6-15 cm). Routine thyroid cytology yielded disappointing diagnostic accuracy (46.7%) in this set of cases. After total thyroidectomy associated with extensive cervical lymph node resection, calcitonin values remained lower than 5 pg/mL for at least 12 months in eight of the cases (30.8%). Immunocyto- and histochemistry for calcitonin were positive in all analyzed cases. None of the 26 cases presented germline mutations in the classical hotspots of the RET proto-oncogene. CONCLUSION: Our cases were identified late. The basal calcitonin measurements and immunostaining for calcitonin were highly useful for diagnosing s-medullary thyroid carcinoma. The rate of complete patient recovery was low, and none of the parameters analyzed were useful predictors of the thyroid tumor size. Our findings support previous recommendations for routine serum calcitonin evaluation and immunostaining analysis involving single thyroid nodules.

Assuntos

Carcinoma Medular/patologia , Neoplasias da Glândula Tireoide/patologia , Adolescente , Adulto , Biomarcadores Tumorais/sangue , Calcitonina/sangue , Carcinoma Medular/sangue , Carcinoma Medular/genética , Feminino , Mutação em Linhagem Germinativa/genética , Hospitais Universitários , Humanos , Masculino , Pessoa de Meia-Idade , Proto-Oncogene Mas , Proteínas Proto-Oncogênicas c-ret/genética , Estudos Retrospectivos , Neoplasias da Glândula Tireoide/sangue , Neoplasias da Glândula Tireoide/genética , Carga Tumoral

RESUMO

INTRODUCTION: Medullary thyroid carcinoma may occur in a sporadic (s-medullary thyroid carcinoma, 75 percent) or in a multiple endocrine neoplasia type 2 form (MEN2, 25 percent). These clinical forms differ in many ways, as s-medullary thyroid carcinoma cases are RET-negative in the germline and are typically diagnosed later than medullary thyroid carcinoma in MEN2 patients. In this study, a set of cases with s-medullary thyroid carcinoma are documented and explored. PURPOSE: To document the phenotypes observed in s-medullary thyroid carcinoma cases from a university group and to attempt to improve earlier diagnosis of s-medullary thyroid carcinoma. Some procedures for diagnostics are also recommended. METHOD: Patients (n=26) with apparent s-medullary thyroid carcinoma were studied. Their clinical data were reviewed and peripheral blood was collected and screened for RET germline mutations. RESULTS: The average age at diagnosis was 43.9 years (± 10.82 SD) and did not differ between males and females. Calcitonin levels were increased in all cases. Three patients presented values that were 100-fold greater than the normal upper limit. Most (61.54 percent) had values that were 20-fold below this limit. Carcinoembryonic antigen levels were high in 70.6 percent of cases. There was no significant association between age at diagnosis, basal calcitonin levels or time of disease onset with thyroid tumor size (0.6-15 cm). Routine thyroid cytology yielded disappointing diagnostic accuracy (46.7 percent) in this set of cases. After total thyroidectomy associated with extensive cervical lymph node resection, calcitonin values remained lower than 5 pg/mL for at least 12 months in eight of the cases (30.8 percent). Immunocyto- and histochemistry for calcitonin were positive in all analyzed cases. None of the 26 cases presented germline mutations in the classical hotspots of the RET proto-oncogene. CONCLUSION: Our cases were identified late. The basal ...

Assuntos

Adolescente , Adulto , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Carcinoma Medular/patologia , Neoplasias da Glândula Tireoide/patologia , Calcitonina/sangue , Carcinoma Medular/sangue , Carcinoma Medular/genética , Mutação em Linhagem Germinativa/genética , Hospitais Universitários , Proteínas Proto-Oncogênicas c-ret/genética , Estudos Retrospectivos , Carga Tumoral , Neoplasias da Glândula Tireoide/sangue , Neoplasias da Glândula Tireoide/genética , Biomarcadores Tumorais/sangue

RESUMO

Hypercalcitoninemia has frequently been reported as a marker for medullary thyroid carcinoma. Currently, calcitonin measurements are mostly useful in the evaluation of tumor size and progression, and as an index of biochemical improvement of medullary thyroid carcinomas. Although measurement of calcitonin is a highly sensitive method for the detection of medullary thyroid carcinoma, it presents a low specificity for this tumor. Several physiologic and pathologic conditions other than medullary thyroid carcinoma have been associated with increased levels of calcitonin. Several cases of thyroid nodules associated with increased values of calcitonin are not medullary thyroid carcinomas, but rather are related to other conditions, such as hypercalcemias, hypergastrinemias, neuroendocrine tumors, renal insufficiency, papillary and follicular thyroid carcinomas, and goiter. Furthermore, prolonged treatment with omeprazole (> 2-4 months), beta-blockers, glucocorticoids and potential secretagogues, have been associated with hypercalcitoninemia. An association between calcitonin levels and chronic auto-immune thyroiditis remains controversial. Patients with calcitonin levels >100 pg/mL have a high risk for medullary thyroid carcinoma (~90%-100%), whereas patients with values from 10 to 100 pg/mL (normal values: <8.5 pg/mL for men, < 5.0 pg/mL for women; immunochemiluminometric assay) have a <25% risk for medullary thyroid carcinoma. In multiple endocrine neoplasia type 2 (MEN2), RET mutation analysis is the gold-standard for the recommendation of total preventivethyroidectomy to relatives at risk of harboring a germline RET mutation (50%). False-positive calcitonin results within MEN2 families have led to incorrect indications of preventive total thyroidectomy to RET mutation negative relatives. In this review, we focus on the differential diagnosis of hypercalcitoninemia, underlining its importance for the avoidance of misdiagnosis...

Assuntos

Feminino , Humanos , Masculino , Calcitonina/sangue , Carcinoma Medular/diagnóstico , Neoplasias da Glândula Tireoide/diagnóstico , Biomarcadores Tumorais/sangue , Carcinoma Medular/sangue , Carcinoma Medular/cirurgia , Diagnóstico Diferencial , Neoplasia Endócrina Múltipla/sangue , Neoplasia Endócrina Múltipla/diagnóstico , Risco , Tireoidectomia , Neoplasias da Glândula Tireoide/sangue , Neoplasias da Glândula Tireoide/cirurgia

RESUMO

OBJETIVO: Descrever as dificuldades da endoscopia de contato aplicada à boca e ao lábio (microestomatoscopia de contato) e aplicar nas lesões do lábio os critérios usados na endoscopia de contato de outras topografias. MÉTODO: Estudo prospectivo utilizando o endoscópio de contato Storz 8715A e o corante azul de toluidina. Vinte exames foram feitos para aprendizado da técnica e depois mais 31 (21 lesões do lábio e 10 da boca), todos exames in vivo. Os critérios avaliados foram: Celularidade, Arquitetura, Estratificação e Morfologia. RESULTADOS: A falta de nitidez, os tremores finos e o deslizamento do aparelho dificultaram o procedimento em 100 por cento dos casos, mas permitiram um exame adequado. Os 13 diagnósticos de malignidade das lesões do lábio apresentaram todos os critérios alterados. CONCLUSÃO: as dificuldades encontradas foram o contato do aparelho com a superfície anatômica, o deslizamento do aparelho, os tremores finos e a falta de nitidez da imagem, que não inviabilizaram a realização e a interpretação do exame. Os critérios são aplicáveis às lesões da boca e do lábio inferior.

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BACKGROUND: 1- To describe difficulties of contact endoscopy related to mouth and lip (contact microstomatoscopy) and 2- apply the criteria used in contact endoscopy of other topographies when lip lesions are diagnosed. METHODS: A prospective study was performed with the contact endoscope Storz 8715A and toluidine blue was used. Twenty examinations were accomplished in order to learn the technique; after that, other 31 were included (21 lip lesions and 10 oral lesions), all in vivo examinations. The criteria assessed were: cellularity, architecture, stratification and morphology. RESULTS: Lack of image clearness, slight tremors and sliding of the equipment made the procedure difficult in 100 percent of the cases; even though, accomplishment of proper examination was obtained. The 13 cases of lip malignancy lesions had the criteria altered as a whole. CoNCLUSION: Difficulties found were the contact of the equipment with anatomic surface, the sliding of the equipment, the slight tremors, and the lack of image clearness. Nevertheless, such elements did not interrupt the accomplishment and the examination analysis. The criteria are applied to oral and lower lip lesions.

RESUMO

PURPOSE: Total thyroidectomy (TT) with level VI and VII central neck dissection is the initial treatment for medullary thyroid carcinoma (MTC) without identifiable neck metastasis. Level II to V lateral neck dissection is performed if neck metastasis is present or suspected. We conducted this study to identify the frequency and clinical determinants of skip neck metastasis in MTC. METHODS: We reviewed the medical records of 32 patients who underwent TT and bilateral neck dissection for MTC. The clinical features were correlated with pN status in the central versus lateral compartments of the neck. RESULTS: Neck lymph node metastasis (pN+) was found in 20 patients (62.5%) and skip metastases were found in 7 (35%) patients. The sensitivity of the pN status of the central compartment of the neck to predict the pN status of the lateral compartment of the neck was 53.8% and specificity was 63.2%. We found pN+ in 90% of the patients with lymph nodes >15 mm in diameter versus 50% in those with lymph nodes <15 mm in diameter. CONCLUSIONS: There is skip metastasis in MTC. It is unsafe to use the lymph node status of the central compartment of the neck to define the pN status of the lateral neck. A lymph node greater than 15 mm in diameter is related to pN status.

Assuntos

Carcinoma Medular/patologia , Metástase Linfática/patologia , Neoplasias da Glândula Tireoide/patologia , Carcinoma Medular/cirurgia , Feminino , Humanos , Masculino , Esvaziamento Cervical , Neoplasias da Glândula Tireoide/cirurgia , Tireoidectomia

RESUMO

OBJECTIVE: To analyze the factors in parotid malignant epithelial tumors influencing recurrences and disease-specific survival. METHODS: We retrospectively reviewed the files of 150 patients treated at our institution, from 1974 to 1998. Twenty-four patients were not treated by surgery and were excluded from this study. The remaining 126 patients were treated with surgery and 74 patients had postoperative radiotherapy. Thirty-three patients were treated with parotidectomy plus neck dissection. Neck lymph node metastasis was found in 22 patients, 5 patients had occult neck metastasis, and 4 periparotid lymph nodes metastasis. The mean age was 49 years old. According to the UICC/1997 TNM Classification, 49 patients were stage I, 27 stage II, 22 stage III, and 28 stage IV. The influence of selected factors on the 10 year disease-specific survival was analyzed using the Kaplan-Meier actuarial method and the log-rank test. RESULTS: Forty patients had mucoepidermoid carcinoma, 18 patients adenocarcinoma NOS, 18 patients acinic cell carcinoma, 15 patients adenoid cystic carcinoma, 11 patients malignant mixed tumor, 11 patients salivary duct carcinoma, and 13 patients other pathology. Twenty-five patients had recurrences: 17 had local recurrences, 4 patients had neck recurrences, and 4 were loco-regional recurrences. Five factors influenced negatively the prognosis: 1) T stage (p.00001), 2) grade (p.00001), 3) + lymph nodes (p.0007), 4) facial nerve dysfunction (p.0001), and 5) age (p.004). Patients with high-grade tumors and high-stage tumors had the worst prognosis according to the multivariate analysis. The 10-year disease-specific survival was 97% for stage I, 81% for stage II, 56% for stage III, and 20% for stage IV. CONCLUSION: The grade of the tumor and stage were the most important prognostic factor. EBM RATING: C.

Assuntos

Adenocarcinoma/mortalidade , Adenocarcinoma/terapia , Invasividade Neoplásica/patologia , Neoplasias Parotídeas/mortalidade , Neoplasias Parotídeas/terapia , Adenocarcinoma/patologia , Adolescente , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Estudos de Coortes , Terapia Combinada , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Esvaziamento Cervical/métodos , Estadiamento de Neoplasias , Glândula Parótida/efeitos da radiação , Glândula Parótida/cirurgia , Neoplasias Parotídeas/patologia , Probabilidade , Modelos de Riscos Proporcionais , Radioterapia Adjuvante , Estudos Retrospectivos , Medição de Risco , Fatores Sexuais , Análise de Sobrevida , Fatores de Tempo , Resultado do Tratamento

RESUMO

PURPOSE: Description of clinical and epidemiological characteristics of patients who underwent surgery for oral cancer in a Medical School Teaching Hospital, and determination of differences with respect to other institutions and/or periods of time. METHOD: The charts of patients undergoing surgery for oral cancer from 1994 to 2002 were reviewed. Data were collected in a spreadsheet in order to analyze clinical and epidemiological features.. RESULTS: A total of 374 patients having undergone 406 operations was identified. Their ages varied from 14 to 94 years (mean = 57.4 years), with 255 men (68.2%), and 295 out 366 Caucasian (80.6%). A majority had tumors of the tongue and/or floor of mouth (55.6%), while 20.3% had lip cancer. Squamous cell carcinoma was found in 90.3%, and glandular carcinoma in 4%. T4 tumors in 39.6%, Tis or T1 lesions in 15.2% of all patients. Nearly 62% had no regional metastases, and the relative incidence in young patients (40 years or younger) reached 8.6%. CONCLUSION: In spite of the predominance of locally advanced tumors, a majority of patients had no neck metastases. The 31.8% incidence in females indicates an increasing incidence of oral cavity cancer among women when compared to previous periods at the same institution.

Assuntos

Neoplasias Bucais/epidemiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Brasil/epidemiologia , Feminino , Neoplasias de Cabeça e Pescoço/epidemiologia , Neoplasias de Cabeça e Pescoço/secundário , Hospitais de Ensino , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Neoplasias Bucais/patologia , Neoplasias Bucais/cirurgia , Estadiamento de Neoplasias , Estudos Retrospectivos

RESUMO

OBJETIVO: Caracterizar epidemiológica e clinicamente a população atendida por câncer de boca em hospital-escola de atenção terciária e quaternária e verificar variações em relação a outras casuísticas e períodos. MÉTODO: Procedeu-se à revisão dos prontuários dos operados por câncer oral de 1994 a 2002. As características clínicas e epidemiológicas foram colocadas em planilhas e analisadas. RESULTADOS: Foram identificados 374 portadores de câncer da boca que foram submetidos a 406 operações. A idade dos doentes variou de 14 a 94 anos (média = 57,4 anos). Duzentos e cinqüenta e cinco eram do gênero masculino (68,2%). Duzentos e noventa e cinco entre 366 doentes eram caucasianos (80,6%). A maioria era portadora de tumores da língua e/ou do soalho da boca (194 entre 349 doentes; 55,6%), e 71 (20,3%) tinham tumores dos lábios. O carcinoma epidermóide foi encontrado em 90,3% e carcinomas glandulares em 4%. Os tumores T4 estavam presentes em 39,6% dos doentes; 15,2% tinham lesões Tis ou T1. Quase 62% dos pacientes não tinham metástases cervicais. A incidência relativa em jovens (com até 40 anos de idade) atingiu 8,6%. CONCLUSÃO: Apesar dos achados freqüentemente referidos na literatura terem se confirmado (como o predomínio de lesões avançadas localmente), a maioria dos doentes não apresentava metástases cervicais. Acima do observado em outras casuísticas, os 31,8% de mulheres na presente casuística indica a preocupante e crescente incidência no gênero feminino.

Assuntos

Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias Bucais/epidemiologia , Brasil/epidemiologia , Hospitais de Ensino , Neoplasias de Cabeça e Pescoço/epidemiologia , Neoplasias de Cabeça e Pescoço/secundário , Incidência , Neoplasias Bucais/patologia , Neoplasias Bucais/cirurgia , Estadiamento de Neoplasias , Estudos Retrospectivos

RESUMO

OBJETIVO: A ocorrência de carcinoma papilífero da tireóide (CPT) em doentes com hiperparatireoidismo (HPT) suscita dúvidas quanto a ser apenas coincidência ou apresentar relação causal. O objetivo deste trabalho é verificar se a incidência de CPT em diferentes formas de HPT é semelhante entre si e à incidência de CPT em achados de necropsias, assim como em doentes submetidos à tireoidectomia na mesma região. MÉTODO: Os dados de 222 pacientes consecutivos tratados por HPT foram revistos e foi analisada a incidência de CPT. Os pacientes foram estratificados em HPT primário (107) e HPT secundário (115). Os laudos anatomopatológicos foram revistos, a incidência de CPT foi pesquisada e suas características nesses indivíduos foram estudadas. Esses dados foram comparados a dados encontrados em casos de necrópsia e em 89 casos de bócio compressivo/mergulhante. Empregou-se o teste exato de Fisher e o teste t não pareado. RESULTADOS: Os laudos foram passíveis de análise em 103 casos de HPT primário, com 10 pacientes com CPT (9,7 por cento) e em 111 portadores de HPT secundário, com três CPT associados (2,7 por cento). Houve diferença entre o HPT primário e HPT secundário (p=0,04). Essa diferença também foi significativa em relação aos 1 por cento de CPT achados em necrópsia na região (p=0,0001). Não houve diferença com relação à incidência de 11,2 por cento de CPT no grupo operado por compressão e também em relação às características dos tumores, apesar de haver 80 por cento de multicentricidade no CPT de doentes com HPT primário. CONCLUSÕES: A ocorrência de CPT em HPT primário é maior que em HPT secundário e que em achados de necropsia.

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BACKGROUND: Association of papillary thyroid carcinoma (PTC) and hyperparathyroidism (HPT) has not been clearly defined. The incidence of PTC in different types of HPT and necropsy or patients submitted to thyroidectomy in the same region is analyzed to verify if this association is casual or not. METHODS: Data of 222 consecutive patients operated for HPT were reviewed and incidence of PTC was defined. Patients were analyzed as primary HPT (107) and secondary (115). The incidence of PTC was compared to that found in necropsy and to that observed in 89 patients with compressive multinodular goiter submitted to thyroidectomy. Statistical analysis included Fisher's exact test and Student's t test. RESULTS: Pathology reports were available in 103 cases of primary HPT, and in 10 patients PTC was detected (9.7 percent). In 111 secondary HPT patients, PTC was found in three (2.7 percent), with statistical significant difference between primary and secondary HPT (p=0.04). This difference was also significant of the 1 percent incidence of PTC found in necropsy in the same area (p=0.0001). No difference was observed in relation to the incidence of 11.2 percent of PTC found in patients operated for compressive goiter. Tumor characteristics were not statistically different, although multicentricity was detected in 80 percent of PTC of patients with primary HPT. CONCLUSION: The incidence of PTC was elevated in patients with primary HPT, in relation to necropsy or secondary HPT cases.

RESUMO

Muitas complicações orais podem ser observadas em pacientes que receberam radioterapia no tratamento do câncer bucal. O cirurgião-dentista deve estar familiarizado com os protocolos disponíveis para o manejo destes pacientes,prevenindo suas futuras complicações e deterioração bucal. O objetivo deste trabalho foi identificar as possíveis complicações bucais em pacientes vitimas de câncer da cavidade bucal eorofaringe submetidos a radioterapia, e assim propor um protocolo de prevenção e controle destas seqüelas. Trinta indivíduos com carcinoma epidermóide foram incluídos. Doze destes pacientes receberam radioterapia e foram clinicamente avaliados tendo seus resultados comparados com 18 pacientes ainda não tratados. Os achados clínicos incluíram cáries,doença periodontal, fatores traumáticos, mucosite, trismo eosteorradionecrose. Os pacientes irradiados foram acompanhados por seis meses e seus fluxos e pH salivares foram determinados e comparados com o outro grupo. Os resultados mostraram que a ausência do fluxo salivar esteve presente em 17 por cento dos pacientes irradiados e ainda que a médiade fluxo salivar destes pacientes era bem mais baixa(0,2ml/min) que os não irradiados (1,4ml/min). A média do pH salivar dos pacientes irradiados foi de 6,03 não sendo considerado diferente estatisticamente do pH do grupo não irradiado (pH= 5.96). Quatro pacientes irradiados exibiram cárie de radiação (33por cento), nove desenvolveram trismo (75 porcento) eoito mucosite (67 porcento). Apenas um caso de osteorradionecrose foiverificado sei meses após a radioterapia. Assim, foi verificado que os efeitos da radiação são mais significantes com relação ao fluxo salivar do que com a alteração do pH; 1/3 dos pacientes irradiados apresentaram alterações importantes logo após a radioterapia e a osteorradionecrose, apesar de poder surgir logo após o tratamento, é normalmente observado um ano apósa radioterapia. A condição oral dos pacientes irradiados requerum tratamento multidisciplinar

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Many oral complications are observed in radiotherapy treated cancer patient. Dentist must be familiar with the available treatment regimens for managing these conditions, and preventing future deterioration in oral health immediately after cancer diagnosis in order to control oral complications. The purpose of this study was to identify oral complications of the head and neck cancer patients before and after radiotherapy and to establish a protocol to prevent and control these sequelae. Thirty patients with squamous cell carcinoma of oral and oropharynx were included. Twelve of them received radiotherapy and were clinically evaluated and them compared to the remaining 18 who had not been treated yet. Clinical features included: presence of dental caries, periodontal disease, traumatic factors, mucositis, trismus and osteoradionecrosis. Irradiated patients were followed for six months. Salivary flow and pH were also determined and compared. Results showed that the absence of salivary flow was confirmed in 17% irradiated patients. The mean salivary flow of irradiated patients was 0.2ml/minute and 1.4 ml/minute in the non treated group. The mean salivary pH was 6.03 in irradiated patients, and showed to be comparable to the pH of non treated patients (pH= 5.96). Four irradiated patients (33%) presented radiation caries, 9 developed trismus (75%), and 8 had mucositis (67%). A single case of osteoradionecrosis six month after radiotherapy was observed. Though, radiation affects mainly salivary flow instead of salivary pH; 1/3 of irradiated patients present radiation caries, mucositis and trismus early after therapy. Osteoradionecrosis may be seen soon after radiotherapy although, it's usually observed one year after the treatment. Poor oral conditions observed in treated and non treated patients demanding a multidisciplinary group care.

Assuntos

Humanos , Carcinoma de Células Escamosas/patologia , Carcinoma de Células Escamosas/prevenção & controle , Neoplasias Bucais/diagnóstico , Neoplasias de Cabeça e Pescoço/patologia , Radioterapia/efeitos adversos , Carcinoma de Células Escamosas/diagnóstico , Distribuição de Qui-Quadrado , Neoplasias Bucais/patologia , Neoplasias de Cabeça e Pescoço/diagnóstico , Radioterapia/métodos

RESUMO

Sao analisados diferentes aspectos de 100 pacientes submetidos a parotidectomias, consecutivas, no periodo de janeiro de 1981 a janeiro de 1989. Os resultados sao comparados e discutidos,com base na literatura consultada, sobre tumores de parotida e parotidectomias. Foram realizadas 72 parotidectomias superficiasis e 18 parotidectomias totais, com achado de 69% de neoplasias benignas, 17% de neoplasias malignas, 4% de sialoadenite cronica e 10% de tumores nao parotideos. A incidencia de tumores do lobo profundo da glandula foi de 17%. Observamos, no pos-operatorio, deficit motor-temporario no territorio do nervo facial em 34% dos pacientes. A recidiva, com acompanhamento de cinco anos em media, foi de 3%. Nosso estudo apresenta certas peculiaridades, mas e, em geral, similar aos encontrados na literatura, quando comparadas as estatisticas

Assuntos

Criança , Adolescente , Adulto , Pessoa de Meia-Idade , Humanos , Masculino , Feminino , Glândula Parótida/cirurgia , Neoplasias das Glândulas Salivares