title: AJR teaching file: fat-containing retroperitoneal mass presenting with acute flank pain.
authors.affiliation: Department of Diagnostic Imaging, The Warren Alpert Medical School of Brown University and Rhode Island Hospital, 593 Eddy St., Providence, RI 02903, USA.
authors.forename: Justin R
authors.initials: JR
authors.lastname: Routhier
authors.forename: Courtney A
authors.initials: CA
authors.lastname: Woodfield
authors.forename: William W
authors.initials: WW
authors.lastname: Mayo-Smith
mesh_terms: D003937:Diagnosis, Differential; D021501:Flank Pain / Q000000981:diagnostic imaging*; D006470:Hemorrhage / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D008067:Lipoma / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D008875:Middle Aged; D010534:Peritoneal Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery; D014057:Tomography, X-Ray Computed / Q000379:methods*