Abstract
Teratomas are germ cell neoplasias consisting of tissue from the three layers of the developing embryo (ectoderm, mesoderm, and endoderm). These tumors are most commonly found within the ovary; extra-ovarian mature teratomas in adults are considered to be rare. A 64-year-old woman, gravida 4 para 4, had an 8×7 cm solid pelvic mass posterior to the uterus by examination and radiologic studies. On exploratory laparotomy, an extra-ovarian mature teratoma arising from the peritoneum in the posterior cul de sac was found. This is the first reported case of extra-ovarian mature teratoma arising from the peritoneum in the posterior cul de sac. Even though extra-ovarian teratomas are rare in adults, they should be considered in the differential diagnosis in a woman with a pelvic mass of unclear origin. (J GYNECOL SURG 15:159, 1999)
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