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Objectives. To study 18F-Choline PET/CT in the diagnosis and biopsy guide of prostate cancer (pCa) in patients with persistently high prostate-specific antigen (PSA) and previous negative prostate biopsy. To compare the clinical risk factors and metabolic variables as predictors of malignancy. Methods. Patients with persistently elevated PSA in serum (total PSA >4ng/mL) and at least a previous negative or inconclusive biopsy were consecutively referred for a whole body 18F-Choline PET/CT. Patient age, PSA level, PSA doubling time (PSAdt) and PSA velocity (PSAvel) were obtained. PET images were visually (positive or negative) and semiquantitatively (SUVmax) reviewed. 18F-Choline uptake prostate patterns were defined as focal, multifocal, homogeneous or heterogeneous. Histology on biopsy using transrectal ultrasound-guided approach was the gold standard. Sensitivity (Se), specificity (Sp) and accuracy (Ac) of PET/CT for diagnosis of pCa were evaluated using per-patient and per-prostate lobe analysis. Receiver-operating-characteristic (ROC) curve analysis was used to assess the value of SUVmax to diagnose pCa. Correlation between PET/CT and biopsy results per-prostate lobe was assessed using the Chi-square test. Univariate and multivariate logistic regression analysis were applied to compare clinical risk factors and metabolic variables as predictors of malignancy. Results. Thirty-six out of 43 patients with histologic confirmation were included. In 11 (30.5%) patients, pCa was diagnosed (Gleason score from 4 to 9). The mean values of patient age, PSA level, PSAdt and PSAvel were: 65.5 years, 15.6ng/ml, 28.1 months and 8.5ng/mL per year, respectively. Thirty-three patients had a positive PET/CT; 18 had a focal pattern, 7 multifocal, 4 homogeneous and 4 heterogeneous. Se, Sp and Ac of PET/CT were of 100%, 12% and 38% in the patient based analysis, and 87%, 29% and 14% in the prostate lobe based analysis, respectively. The ROC curve analysis of SUVmax showed an AUC of 0.568 (p=0.52). On a lobe analysis, poor agreement was observed between PET/CT findings and biopsy results (p=0.097). In the univariate/multivariate analysis, none of clinical and metabolic variables were statistically significant as predictor of pCa. Conclusion. Choline PET/CT is a suitable procedure for the detection of pCa in highly selected patients, however, a high rate of false positive should be expected (AU)

Objetivos. Estudiar el valor de la PET/TC con 18F-Colina en el diagnóstico y guía de biopsia para cáncer de próstata (pCa) en pacientes con PSA elevado y biopsias previas negativas. Comparar los factores de riesgo y las variables metabólicas como predictores de malignidad. Métodos. Se incluyeron pacientes derivados para PET/CT con 18F-colina, con PSA total sérico elevado (>4ng/mL) y al menos una biopsia negativa o no conclusiva para pCa. Se valoró la edad, el nivel de PSA, el tiempo de duplicación y la velocidad del PSA. La PET fue valorada visual (positiva y negativa) y semicuantitativamente (SUVmáx). Se definieron los patrones de captación como focal, multifocal, homogéneo y heterogéneo. El diagnóstico final se obtuvo mediante histología obtenida por medio de biopsia guiada por ecografía transrectal. Se valoró sensibilidad, especificidad y precisión diagnóstica utilizando un análisis por paciente y por lóbulos. Se utilizó una curva ROC para determinar el valor diagnóstico del SUVmáx. Para valorar la correlación entre PET/TC y los resultados de la biopsia por lóbulos, se utilizó el test de Chi-Cuadrado. Realizamos un análisis univariado y multivariado mediante regresión logística para analizar los factores de riesgo y variables metabólicas como predictores de malignidad. Resultados. Se incluyeron 36/43 pacientes con confirmación histológica. En 11 pacientes se diagnosticó pCa (Gleason de 4-9). El valor medio de edad, el nivel de PSA, el tiempo de duplicación y la velocidad de PSA fueron: 65,5 años, 15,6ng/ml, 28,1 meses y 8,5ng/mL por año, respectivamente. En 33 pacientes la PET/TC fue positiva: 18 presentaron patrón focal, 7 multifocal, 4 homogéneo y 4 heterogéneo. La sensibilidad, especificidad y precisión diagnóstica fue del 100%, 12% y 38% en el análisis por paciente, y 87%, 29% y 14% en el análisis por lóbulos, respectivamente. La curva ROC del SUVmáx mostró un AUC de 0,568 (p=0,52). En el análisis por lóbulos se observó un escaso grado de acuerdo (p=0,097). Ninguna de las variables clínicas y metabólicas fue estadísticamente significativa como predictor de pCa en el análisis univariado/multivariado. Conclusión. La PET/TC con 18F-Colina es un procedimiento aceptable para la detección de cáncer de próstata en pacientes seleccionados. No obstante, puede presentar una alta tasa de falsos positivos (AU)

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OBJECTIVES: To study 18F-Choline PET/CT in the diagnosis and biopsy guide of prostate cancer (pCa) in patients with persistently high prostate-specific antigen (PSA) and previous negative prostate biopsy. To compare the clinical risk factors and metabolic variables as predictors of malignancy. METHODS: Patients with persistently elevated PSA in serum (total PSA >4ng/mL) and at least a previous negative or inconclusive biopsy were consecutively referred for a whole body 18F-Choline PET/CT. Patient age, PSA level, PSA doubling time (PSAdt) and PSA velocity (PSAvel) were obtained. PET images were visually (positive or negative) and semiquantitatively (SUVmax) reviewed. 18F-Choline uptake prostate patterns were defined as focal, multifocal, homogeneous or heterogeneous. Histology on biopsy using transrectal ultrasound-guided approach was the gold standard. Sensitivity (Se), specificity (Sp) and accuracy (Ac) of PET/CT for diagnosis of pCa were evaluated using per-patient and per-prostate lobe analysis. Receiver-operating-characteristic (ROC) curve analysis was used to assess the value of SUVmax to diagnose pCa. Correlation between PET/CT and biopsy results per-prostate lobe was assessed using the Chi-square test. Univariate and multivariate logistic regression analysis were applied to compare clinical risk factors and metabolic variables as predictors of malignancy. RESULTS: Thirty-six out of 43 patients with histologic confirmation were included. In 11 (30.5%) patients, pCa was diagnosed (Gleason score from 4 to 9). The mean values of patient age, PSA level, PSAdt and PSAvel were: 65.5 years, 15.6ng/ml, 28.1 months and 8.5ng/mL per year, respectively. Thirty-three patients had a positive PET/CT; 18 had a focal pattern, 7 multifocal, 4 homogeneous and 4 heterogeneous. Se, Sp and Ac of PET/CT were of 100%, 12% and 38% in the patient based analysis, and 87%, 29% and 14% in the prostate lobe based analysis, respectively. The ROC curve analysis of SUVmax showed an AUC of 0.568 (p=0.52). On a lobe analysis, poor agreement was observed between PET/CT findings and biopsy results (p=0.097). In the univariate/multivariate analysis, none of clinical and metabolic variables were statistically significant as predictor of pCa. CONCLUSION: Choline PET/CT is a suitable procedure for the detection of pCa in highly selected patients, however, a high rate of false positive should be expected.

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El manejo de los cuellos N0 en pacientes con carcinoma epidermoide de cabeza y cuello es controvertido. Objetivo. Demostrar la eficacia diagnóstica de la biopsia del ganglio centinela (GC) en los pacientes con carcinoma epidermoide oral con cuello clínicamente negativo. Metodología. Se realiza un estudio prospectivo de 12 pacientes consecutivos, hasta el momento, con carcinoma epidermoide oral de cualquier tamaño y cuello clínicamente negativo que no habían recibido tratamiento antitumoral, asistidos en el S. de Cirugía Maxilofacial del área del H.U.V.M de Sevilla. A estos pacientes se les realiza una linfografía cervical con nanocoloides -Tc 99 para localizar el GC, y una dosis de recuerdo antes de iniciar el ttº quirúrgico. Durante la cirugía se localiza el GC con la sonda y se extirpa, se completa la disección cervical funcional y la extirpación de la lesión con posteriores estudios histológicos independientes. Resultados. índice de linfolocalización: 91 por ciento, índice de radiolocalización 100 por ciento, falsos negativos 0 por ciento, la sensibilidad y VPN del 100 por ciento, cocientes de probabilidades positivo > 10 y negativo < 0,1. Conclusiones. La técnica es eficaz para detectar GC-metástasico y es una guía prometedora para indicar la disección cervical (Subvención FIS 2002) (AU)

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Amyloidosis can be defined as an extracellular deposit of the amyloid fibrillar protein in one or more locations in the organism. Multiple clinical and biochemical forms of amyloid exist, and are characterized according to their fibrillar structural characteristics. The Red Congo stain presents green fluorescence when histologic cuts are observed by polarized light. The deposits of this substance can be focal in nearly any area of the organism, although the perivascular space tends to be affected. We present the case of a woman operated on for myeloma at the base of the cranium who showed no wider affectation at a later study. Fourteen years after the operation the patient showed a progressive growth of the submandibular gland that was diagnosed as a pathological amyloid deposit.

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La amiloidosis se puede definir como el depósito extracelular de la proteína fibrilar amiloide de una o más localizaciones del organismo. Existen múltiples formas clínicas y bioquímicas diferentes de amiloide que se caracterizan según la estructura fibrilar características que poseen todas ell. La tinción de Rojo Congo hace que presente una birrefrigencia verde exclusiva cuando los cortes histológicos se observan bajo luz polarizada. Los depósitos de esta sustancia pueden ser focales prácticamente en cualquier zona del organismo, aunque suele afectar al espacio perivascular. Presentamos el caso de una mujer intervenida de un mieloma de base de cráneo sin que el estudio posterior demostrase una afectación más amplia, a los 14 años de la intervención presentó un crecimiento progresivo de la glándula submandibular que el estudio anatomopatológico diagnóstico depóstico patológico de amiloide (AU)

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The case of a chylous cervical fistula detected immediately after radical neck dissection is presented. The flow and metabolic derangements secondary to depletion of fluid, electrolytes, and protein required the ligation of the thoracic duct at the thoracic cavity. The various possible treatments of chylous fistula are reviewed.

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