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Wednesday 10 March 2004


Definition: Teratomas are neoplasms comprised of mixed elements derived from the three germ cell layers.


- Gastric teratoma in a 1yo male

A teratoma is generally defined as a tumor arising from pluripotent cells, and it is precisely the heterogeneity of tissues present in such a tumor that best characterizes it; it is also commonly accepted that a teratoma must contain derivatives of more than one blastodermic layer, according
to traditional concepts of embryonic ontogenesis.

Microscopical types

-  mature teratoma

According to age

- fetal teratoma
- neonatal teratoma

According to the localization

-  gonadal teratoma

- extragonadal teratoma



- mature ovarian teratoma (by Washington Deceit)

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See also

- Tumors

  • germ cell tumors (GCTs )
    • teratoma