Immature teratoma is defined as a teratoma containing a variable amount of immature, embryonal type tissue. We hereby present a case of immature teratoma in a 12 years old girl presented with a history of abdominal pain and gradual increase in the abdominal size with high preoperative tumor markers like AFP, CA 125 and CEA levels. Histopathology revealed an immature teratoma grade 3 associated with massive gliomatosis peritonei of omentum and pouch of Douglas.

Keywords: Ovarian teratoma, Immature teratoma, Gliomatosis peritonei.

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Niladri Sarkar