NCIt definition : A testicular germ cell tumor derived from postpubertal-type germ cells. It is characterized
by the presence of three cell types: round cells with eosinophilic cytoplasm, small
cells with dark nucleus and a small amount of cytoplasm, and mono-or multinucleated
giant cells. The neoplastic cells are not cohesive. There is an edematous stroma present;
lymphocytic infiltrates are rarely seen. Most patients are older males.;