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INTRODUCTION: Immature teratoma comprises approximately 3% of ovarian teratomas and 15-20% of all primitive germ cell tumors of the ovary. It is composed of embryonal (immature) as well as variable amounts of histologically mature tissues derived from all the three germ cell layers. It usually presents as a pelvic mass in children and adolescents. Serum AFP may be elevated due to immature hepatoid or intestinal elements.

Image courtesy of Dr. Jean-Christophe Fournet, Paris, France; humpath.com; Used with permission

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