title: Polypoid endometriosis of the ovary mimicking ovarian carcinoma dissemination: a case report and literature review.
abstract: Polypoid endometriosis is a rare type of endometriosis. We report a case of polypoid endometriosis of the ovary mimicking ovarian carcinoma with peritoneal dissemination. Computed tomography and magnetic resonance imaging showed a left ovarian endometriotic cyst containing several nodules in the cystic wall that displayed enhancement, and pelvic nodules on the right ovary. A preoperative or intraoperative diagnosis to avoid the unnecessary extended operation is important for such disease. Retrospective magnetic resonance imaging analysis identified a peculiar finding for polypoid endometriosis: all solid nodules had a round and smooth shape and displayed a low-signal-intense marginal edge on T2-weighted images, suggesting that this is an important finding for differentiating polypoid endometriosis from ovarian carcinoma arising from endometriosis.
authors.affiliation: Department of Obstetrics and Gynecology, Shinshu University School of Medicine, Matsumoto, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Yamada
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Miyamoto
authors.forename: Akiko
authors.initials: A
authors.lastname: Horiuchi
authors.forename: Ayumi
authors.initials: A
authors.lastname: Ohya
authors.forename: Tanri
authors.initials: T
authors.lastname: Shiozawa
mesh_terms: D000328:Adult; D004715:Endometriosis / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D010049:Ovarian Diseases / Q000473:pathology*; D010051:Ovarian Neoplasms / Q000473:pathology*; D011127:Polyps / Q000473:pathology*
keywords: differential diagnosis; magnetic resonance imaging; ovarian cancer; polypoid endometriosis