logo logo
Search: Organ site Search: Tumor / Syndrome
WHO Classification of Tumours
Seminoma, NOS
Testis/Male genital organs


A radiosensitive malignant germ cell tumor found in the testis (especially undescended) and, less frequently, extragonadal sites. It is characterized by the presence of uniform cells with clear or dense cytoplasm which contains glycogen, and by a large nucleus which contains one or more nucleoli. The neoplastic germ cells form aggregates separated by fibrous septa. The fibrous septa contain chronic inflammatory cells, mainly lymphocytes.