title: MR imaging features of bizarre parosteal osteochondromatous proliferation of bone (Nora's lesion).
abstract: The purpose of this study was to review the imaging findings of three patients with bizarre parosteal osteochrondromatous proliferation of bone (BPOP). The plain radiographs and MRI images of three patients with BPOP were obtained and retrospectively reviewed. In two cases, BPOP involved the feet. In one case BPOP involved the hand. In all three cases, plain radiographs showed a well-defined calcium containing mass adjacent to the cortical surface of the adjacent bone. The underlying bone appeared normal in all cases. On MRI, the lesion was of low signal intensity on T1 weighted sequences in all cases. On FSE T2 weighted and STIR sequences, the lesion was of high signal in all cases. The cortex, medullary cavity and adjacent soft tissues appeared normal in all cases. While BPOP is rare and often confused with a variety of both benign and malignant lesions, there are specific radiological findings that may help to distinguish BPOP from many of its mimickers.
authors.affiliation: Department of Radiology, Vancouver General Hospital, University of British Columbia, 899 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9.
authors.forename: W C
authors.initials: WC
authors.lastname: Torreggiani
authors.forename: P L
authors.initials: PL
authors.lastname: Munk
authors.forename: K
authors.initials: K
authors.lastname: Al-Ismail
authors.forename: J X
authors.initials: JX
authors.lastname: O'Connell
authors.forename: S
authors.initials: S
authors.lastname: Nicolaou
authors.forename: M J
authors.initials: MJ
authors.lastname: Lee
authors.forename: B A
authors.initials: BA
authors.lastname: Masri
mesh_terms: D000293:Adolescent; D000328:Adult; D001859:Bone Neoplasms / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008682:Metatarsal Bones / Q000000981:diagnostic imaging / Q000473:pathology; D015831:Osteochondroma / Q000175:diagnosis*; D011859:Radiography; D012189:Retrospective Studies; D013933:Thumb / Q000000981:diagnostic imaging / Q000473:pathology