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Placental teratoma: A case report and review of the literature.

Teratoma is a complex tumor composed of a collection of heterogeneous cells and/or organoid structures reminiscent of normal derivatives of the germ cell. It occurs in both male and female genital systems and other organs along the midline of the body, with similar morphology and classification. Ovarian teratomas constitute 15%-20% of all ovarian tumors, yet teratomas are very rare in the placenta. Benign mature teratoma has mature tissue deriving from two or more germ cell layers, while immature malignant teratoma has both mature and immature elements, especially immature neuroepithelial elements. Furthermore, the third variant, the monodermal teratoma, is composed of only one specialized tissue, such as thyroid tissue. Benign mature teratoma is the only variant described in the placenta. The main interest in this tumor of the placenta is to differentiate it from fetus acardius amorphus. This paper reports the first case of benign placental teratoma in Saudi Arabia.