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Choriocarcinoma is a malignant germ cell tumor (GCT) that shows trophoblastic differentiation and resembles extraembryonic chorion. Pure choriocarcinoma of the testis is rare, accounting for only 0.3% of testicular GCTs; however, it is more frequently seen as a component of mixed GCTs (15% of cases).
Grossly, choriocarcinoma is a soft, friable tumor with extensive areas of hemorrhage and necrosis (as shown here).
Grossly, choriocarcinoma is a soft, friable tumor with extensive areas of hemorrhage and necrosis (as shown here).