Tubulocystic carcinoma of kidney associated with papillary renal cell carcinoma.

Tubulocystic renal cell carcinoma (TCRCC) is a rare variant of renal cell carcinoma, which has distinct histology but there is some controversy about its association with papillary renal cell carcinoma (PRCC) and cell of origin in literature. We report an 18-year-old girl with the rare TCRCC of kidney associated with PRCC with metastases to the para-aortic nodes. The patient presented with hematuria and a right renal mass with enlarged regional nodes for which a radical nephrectomy with retroperitoneal lymph node dissection was done. On gross examination, a solid cystic lesion involving the lower pole and middle pole of the kidney measuring 12x9x9 cm was seen along with an additional cystic lesion in upper pole of kidney. Microscopically the main tumor showed the typical histology of a tubulocystic carcinoma with multiple cysts filled with secretions lined by variably flattened epithelium with hobnailing of cells. The mass in the upper pole was a high-grade PRCC and the nodal metastases had morphology similar to this component. To conclude, at least a small but definite subset of TCRCC is associated with PRCC, and cases associated with PRCC do seem to have a higher propensity for nodal metastasis as in the case we report.

Collecting duct carcinoma associated with oncocytoma

Collecting duct carcinoma (CDC) is a rare, highly aggressive malignant neoplasm that arises from the collecting duct epithelium of the kidney. CDC was reported to coexist with renal cell and transitional cell carcinomas. We report a rare case of CDC associated with oncocytoma, confirmed by the characteristic histological appearance and immunohistochemistry. We also review the epidemiological, histological and immunohistochemical criteria for diagnosis, in addition to the genetic and cytogenetic aberrations reported in the literature. Identification and reporting CDC is important for the establishment of treatment strategies and monitoring prognosis.

Caracterização de eventos na fibrose túbulo-intersticial tratada com micofenolato mofetil e/ou losartan no modelo de ablação renal / The characteriation of eventss in tubuloointersticial fibrosis attenuated bby losartan and/or micopphenollate mofetil therapy in the remnant kidnney

Para caracterizar os eventos na fibrose túbulo-intersticial renal, foi realizado estudo em ratos submetidos a nefrectomia 5/6 e tratados com micofenolato mofetil e/ou losartan. Cortes histológicos de rim foram submetidos a processamento histológico e imuno-histoquímico para a identificação e quantificação do colágeno e de vários marcadores de células epiteliais, mesenquimais e inflamatórias. O estudo morfométrico foi realizado utilizando-se imagens digitalizadas e método computadorizado de análise de imagem. Verificou-se redução da deposição de colágeno e da expressão daqueles marcadores celulares, principalmente nos grupos tratados com a associação micofenolato mofetil e losartan / In order to characterize the events of tubulointerstitial fibrosis, it was performed a study in 5/6 ablation rats receiving losartan and/or micophenolate mofetil therapy. Kidney sections were submitted to several histochemical and immunohistochemical procedures. Morphometric evaluation was performed using digitalized image and a computer assisted image analyzer...

Análise do padrão de expressão do produto de PKHD1, o gene mutado na doença renal policística autossômica recessiva / Analysis of the expression pattern of the PKHD1 gene product, mutated in autosomal recessive polycistic kidney disease

O gene PKHD1, mutado na doença renal policística autossômica recessiva, apresenta um padrão de splicing complexo associado a múltiplos transcritos alternativos. Neste trabalho estudamos o perfil de expressão de seu produto, poliductina. Análises por western blot revelaram produtos putativos de membrana de >440 kDa e aproximadamente 230 kDa, e de aproximadamente 140 kDa em frações solúveis de rim, fígado e pâncreas. Estudos imunoistoquímicos mostraram marcação em ductos coletores renais e porção ascendente espessa da alça de Henle, em epitélios ductais biliar e pancreático e, no período embrionário, em broto ureteral, ductos biliar e pancreático e glândula salivar. /PKHD1, the gene mutated in autosomal recessive polycystic kidney disease, presents a complex splicing pattern, associated with multiple alternative transcripts. In this work we have studied the expression profile of its product, polyductin. Western blot analysis revealed putative membrane products of >440 kDa and 230 kDa, and of about 140 kDa in soluble fractions in kidney, liver and pancreas. Immunohistochemistry studies showed staining in renal collecting duct and thick ascending limb of Henle, in biliary and pancreatic ductal epithelia and, in the embryonic period, in ureteric bud, biliary and pancreatic ducts and salivary gland...

Carcinoma de celulas de Bellini o carcinoma de los conductos colectores: aspecto por RM / Bellini's Cell Carcinoma or Carcinoma of collecting tubules: appearance by MR

Se presenta el caso de un paciente de 77 años con hematuria y antecedentes de carcinoma de próstata y carcinoma de colon a quien se le encontró masa renal central sólida, con realce heterogéneo con el medio de contraste en los estudios de TAC y RM. Su diagnóstico histopatológico es el de carcinoma de los conductos colectores. Se discuten los diagnósticos diferenciales por imágenes diagnósticas y su caracterización por estudios histopatológico