Resection of a mature cystic teratoma of the liver harboring a carcinoid tumor.

Cystic teratomas are rare pluripotent embryonic tumors which most commonly originate in gonadal organs. Extra-gonadal cystic teratomas are exceedingly uncommon, accounting for only 1% of all cystic teratomas, and have been reported in unusual locations including the kidney, mediastinum and liver. These extra-ovarian cystic teratomas have also been known to harbor other neoplasms including carcinoid tumors. In this report, we describe a unique case of a hepatic cystic teratoma occurring as a combined tumor with a carcinoid in a young female. The patient underwent elective laparoscopic resection of her tumor after extensive radiographic and endoscopic work-up for chronic, non-localizable abdominal pain. We believe the carcinoid tumor arose de novofrom committed differentiation of a cell line within the teratoma, and not metastatic spread.