Most @entity5 arising in the retroperitoneum are non-epithelial, and @entity5 are very rare. We report a case of @entity4347 of the retroperitoneum supposed to be derived from ectopic ovarian tissue. A 56-year-old @entity1 was admitted to the hospital because of @entity1661 , and an abdominal CT scan revealed a @entity5 of the right lower retroperitoneum. We had been observing the @entity1 for 10 years for this lesion, but at this point, the @entity5 showed an increase in size and nodules had appeared inside of the cyst. It was presumed to be malignant, and so the decision was made to perform resection. Upon laparotomy, a large @entity5 was found in the right iliac fossa displacing the ascending colon and the cecum medially. The cyst had no connection with any surrounding structures. The @entity5 was a simple large cyst, measuring 9*7 cm, with a protruding @entity5 inside. The inner space of the cyst was filled with mucinous fluid. Histologically, the @entity5 was diagnosed as a @entity4347 . The @entity1 has currently been undergoing follow-up for 7 months with no evidence of recurrence.

[A Case of XXXX of the Retroperitoneum Supposed to Be Derived from Ectopic Ovarian Tissue].

@entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'cystic tumor', 'epithelial tumors', 'papillary tumor', 'tumors'] @entity1 :: ('9606', 'Species') :: ['woman', 'patient'] @entity4347 :: ('MESH:D018282', 'Disease') :: ['mucinous cystadenocarcinoma'] @entity1661 :: ('MESH:D000008', 'Disease') :: ['abdominal distention']
@entity4347 :: (MESH:D018282,Disease) :: ['Mucinous Cystadenocarcinoma']
