[Ewing's sarcoma of the kidneys with simultaneous seminoma]. / Ewing-Sarkom der Niere bei gleichzeitig vorliegendem Seminom.

Extraosseous Ewing's sarcoma (EOE) is rarely observed in the urinogenital tract, which results in only sporadic descriptions of primary EOE of the kidneys in the literature with cytologic analyses. A timely diagnosis and differentiated therapy of this aggressive disease are compromised by its infrequent appearance and scarce available data. With a simultaneously diagnosed seminoma our case report supports and extends further the data collected so far.