logo logo
Search: Organ site Search: Tumor / Syndrome
WHO Classification of Tumours
Teratoma, NOS
Liver and intrahepatic bile ducts


A non-seminomatous germ cell tumor characterized by the presence of various tissues which correspond to the different germinal layers (endoderm, mesoderm, and ectoderm). It occurs in the testis, ovary, and extragonadal sites including central nervous system, mediastinum, lung, and stomach. According to the level of differentiation of the tissues which comprise the tumor, they are classified as mature teratoma or immature teratoma .