Histopathology of the Testis Hematoxylin and eosin stained, medium power, magnification ×250. A. Mixed germ cell tumor of the testis – highlighting a focus of primary choriocarcinoma as seen by the presence of black triangle – cytotrophoblast and * – syncytiotrophoblast cells. B. Mixed germ cell tumor of the testis – highlighting a focus of embryonal carcinoma associated with * – multiple foci of necrosis. C. Metastatic testicular choriocarcinoma – as seen by the presence of * – metastatic trophoblastic cells with areas of black triangle – central necrosis admixed with # – gastric glands.