seminoma
Chapter: 17
A malignant germ cell tumor composed of polygonal neoplastic cells that have clear cytoplasm, contain glycogen and resemble fetal gonocytes. The tumor cells are arranged into solid nests surrounded by fibrous septa that are infiltrated with Iymphocytes. Seminoma accounts for 40% of all testicular tumors. It has a peak incidence in the 35-45 years age group. The tumor is radiosensitive and can be cured in over 90% of cases.