Giant Mature Cystic Perihepatic Teratoma in an Adult Woman.

Perihepatic teratomas are exceedingly rare extragonadal germ cell tumors that may mimic more common hepatic cystic lesions on imaging. We report a 38-year-old woman with several months of abdominal bloating and early satiety. Laboratory studies and tumor markers (α-fetoprotein and carcinoembryonic antigen) were unremarkable. Magnetic resonance imaging demonstrated a 17.7 cm complex cystic lesion adjacent to the left hepatic lobe with fatty components and a mural nodule. Elective laparotomy revealed a well-encapsulated mass arising from the lesser omentum, excised intact. Histopathology confirmed a mature cystic teratoma with elements from all 3 germ layers. The postoperative course was uneventful.