title: A male case of primary retroperitoneal mucinous cystadenoma: a diagnostic dilemma.
abstract: We report a male case of primary retroperitoneal mucinous cystadenoma (PRMC) that was at initially misdiagnosed as a complicated renal cyst. On ultrasonography, a 71-year-old man was found to have an abdominal mass suspicious for right renal cyst. The initial computed tomography scan showed an unenhanced, low-density mass that deformed the edge of the right kidney into a beak shape. Four years later, the mass had increased in size. Magnetic resonance imaging revealed a cystic lesion. Its intracystic content showed relatively high intensity on a T1-weighted image, and the coronal gadolinium-enhanced T1-weighted image with fat suppression clearly showed a multilocular cystic mass without enhancing mural nodules. The final diagnosis of PRMC was obtained pathologically after surgery. Because PRMC has malignant potential, this rare entity should be considered when a retroperitoneal cystic tumor is evaluated, even in a male patient.
authors.affiliation: Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Fujita
authors.forename: Akihiro
authors.initials: A
authors.lastname: Nishie
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Asayama
authors.forename: Keijiro
authors.initials: K
authors.lastname: Kiyoshima
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Kubo
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Honda
mesh_terms: D000368:Aged; D044963:Biopsy, Fine-Needle; D018291:Cystadenoma, Mucinous / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D003952:Diagnostic Imaging; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis* / Q000473:pathology