ABSTRACT
The descriptive term "mixed epithelial and stromal tumor of the kidney" was recently proposed for a group of renal tumors characterized histologically by a mixture of stromal and epithelial proliferation. It is a rare benign neoplasm of the kidney which has been reported under various names such as adult type mesoblastic nephroma or others. We report a case of mixed epithelial and stromal tumor in a 47 yr old female patient presenting as a partly cystic and partly solid renal mass. Microscopically, the tumor exhibited spindle cell component in solid portion and epithelial proliferation around microcystic areas. Immunoreactive profiles and ultrastructural examination suggested myofibroblastic nature of the stromal cells. We believe this case exemplifies a unique adult renal tumor displaying both epithelial and stromal neoplastic component and has a few unusual features worthy of attention.
Subject(s)
Middle Aged , Humans , Female , Nephroma, Mesoblastic/pathology , Neoplasms, Glandular and Epithelial/pathology , Kidney Neoplasms/pathology , Diagnosis, DifferentialABSTRACT
Se presenta un caso de Nefroma Mesoblástico Congénito (NMC) en un paciente de un año y cinco meses de edad que ingresa por un cuadro diarreico agudo, constatándose en el exámen médico una tumoración abdominal. La ecografía y la tomografía computada de aparato urinario evidenciaron proceso expansivo renal multiquístico derecho. Se realizó nefrectomía diagnosticándose, por el estudio anatomopatológico, nefroma mesoblástico congénito, variante celular a forma multiquística. La evolución fue favorable no presentando evidencias de recidiva local ni metástasis luego de dos años y cuatro meses de seguimiento. Se destaca la importancia del exámen físico exhaustivo durante los controles pediátricos periódicos, lo que permite un diagnóstico temprano de las masas abdominales.