title: [A case of retroperitoneal venous aneurysm].
abstract: Venous aneurysm is a rare entity and the disease occurring in the retroperitoneal space has been reported in only 4 cases. Therefore, the fifth case of retroperitoneal venous aneurysm on the literature was described. A 59-year-old male was referred to our clinic because of painless large mass in the left abdomen. Computed tomography, ultrasonography, and magnetic resonance imaging revealed a cystic mass at the perinephric space. The resected cyst contained yellow-grayish fluid. The cyst wall was microscopically formed of 4 layers; blood and cholesterin, hyaline, muscle and collagen from the inner to outer side. He is well without any trouble after the operation.
authors.affiliation: Department of Urology, Toyota Memorial Hospital.
authors.forename: S
authors.initials: S
authors.lastname: Maeda
authors.forename: M
authors.initials: M
authors.lastname: Tamaki
authors.forename: N
authors.initials: N
authors.lastname: Yamamoto
authors.forename: A
authors.initials: A
authors.lastname: Takeda
authors.forename: M
authors.initials: M
authors.lastname: Kuriyama
authors.forename: Y
authors.initials: Y
authors.lastname: Kawada
authors.forename: Y
authors.initials: Y
authors.lastname: Mizoguchi
authors.forename: M
authors.initials: M
authors.lastname: Kasahara
mesh_terms: D000783:Aneurysm / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012187:Retroperitoneal Space / Q000098:blood supply*; D014057:Tomography, X-Ray Computed