title: Chronic expanding hematoma in the retroperitoneal space: a case report.
abstract: A case of retroperitoneal chronic expanding hematoma complicated with hydronephrosis, which was difficult to diagnose preoperatively, is reported. The patient was a 70-year-old man. An 18 cm mass was detected in the right retroperitoneal space on abdominal CT screening. There were small calcifications in the periphery of the mass that were strongly enhanced in the delayed phase of dynamic CT. The mass involved the right ureter and iliopsoas muscle, resulting in severe hydronephrosis. The histological diagnosis was chronic expanding hematoma.
authors.affiliation: Department of Radiology, Saitama Medical School, Iruma-gun, Japan.
authors.forename: Momoko
authors.initials: M
authors.lastname: Irisawa
authors.forename: Shunji
authors.initials: S
authors.lastname: Tsukuda
authors.forename: Makoto
authors.initials: M
authors.lastname: Amanuma
authors.forename: Atsuko
authors.initials: A
authors.lastname: Heshiki
authors.forename: Isao
authors.initials: I
authors.lastname: Kuroda
authors.forename: Fumihiro
authors.initials: F
authors.lastname: Ogawa
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Kayano
mesh_terms: D000368:Aged; D002114:Calcinosis / Q000000981:diagnostic imaging; D002908:Chronic Disease; D006406:Hematoma / Q000000981:diagnostic imaging*; D006801:Humans; D006869:Hydronephrosis / Q000000981:diagnostic imaging; D008279:Magnetic Resonance Imaging; D008297:Male; D016658:Psoas Muscles / Q000000981:diagnostic imaging; D011856:Radiographic Image Enhancement; D012187:Retroperitoneal Space / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014515:Ureteral Diseases / Q000000981:diagnostic imaging