Mesenteric and Retroperitoneal Mucinous Cystic Neoplasms: A Nongynecologic Process Commonly Managed by Gynecologic Oncologists.

Retroperitoneal mucinous cystic neoplasm is a rare pathology. Data regarding diagnosis and treatment are limited and based on case reports and series. We describe a case series of two patients each presenting with a pelvic mass suspicious for an adnexal neoplasm. Both were treated surgically with complete resection of the suspected tumor. Pathology from both specimens revealed mesenteric-retroperitoneal mucinous cystic neoplasm. Uniquely, both patients had diverticulosis and their perioperative course was complicated by diverticulitis. We investigate a possible correlation between diverticular disease and the histopathology of mesenteric retroperitoneal mucinous cystic neoplasms.