[Renal carcinoma with argyrophil cells]

A case of an unusual type of renal carcinoma is reported. The tumor had a poorly differentiated appearance with focal endocrine differentiation. Scattered argyrophilic cells were revealed by the Grimelius procedure. The relationship of this tumor to other neoplastic processes displaying endocrine differentiation is considered. The present case must be segregated from the classic carcinoid group. It belongs to the heterogeneous class of carcinoma with argyrophil cells and bears some resemblance to the atypical carcinoid.