title: Malignant degeneration of a lumbar osteochondroma into a chondrosarcoma which mimicked a large retropertioneal mass.
abstract: We report a case of a lumbar spinal osteochondroma that transformed into a large chondrosarcoma in a 39-year-old male who presented with an abdominal mass and back pain. This mass was also associated with a fracture of the stalk, which on cross-sectional imaging mimicked a mass of retroperitoneal origin. The diagnosis of chondrosarcoma transforming from a lumbar osteochondroma became apparent when comparison was made with previous studies.
authors.affiliation: Department of Radiology, University of British Columbia, Vancouver Hospital and Health Sciences Centre, 899 West 12th Ave, Vancouver, BC, Canada. estrovski1@me.com
authors.forename: Evgeny
authors.initials: E
authors.lastname: Strovski
authors.forename: Rola
authors.initials: R
authors.lastname: Ali
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Graeb
authors.forename: Peter L
authors.initials: PL
authors.lastname: Munk
authors.forename: Silvia D
authors.initials: SD
authors.lastname: Chang
mesh_terms: D000328:Adult; D002471:Cell Transformation, Neoplastic / Q000473:pathology; D002813:Chondrosarcoma / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging* / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D015831:Osteochondroma / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis; D013125:Spinal Neoplasms / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed