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WHO Classification of Tumours
Teratoma, NOS
Adrenal gland


Definition

Teratoma is 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 .