title: [Bizarre parosteal osteochondromatous proliferation of the metatarsal bone].
abstract: A bizarre parosteal osteochondromatous proliferation (BPOP), also known as a Nora lesion, is a rare benign bone formation. It emanates mainly from the intact cortex of the metaphysis of short tubular bones (hands or feet). Conventional radiographs should be complemented using cross-sectional imaging modalities (CT/MRI). In the absence of symptoms a non-operative regime with radiological and clinical controls is possible. If symptomatic, excision biopsy is the treatment of choice, though a high recurrence rate has been reported. Histopathological examination confirms the diagnosis and typically shows an endochondral ossification zone and an unusually mineralized cartilaginous matrix referred to as "blue bone".
authors: Klinik für Orthopädie und Traumatologie, Kantonsspital Winterthur, Brauerstrasse 15, 8401, Winterthur, Schweiz.
authors: C
authors: C
authors: Hartog
authors: Klinik für Orthopädie und Traumatologie, Kantonsspital Winterthur, Brauerstrasse 15, 8401, Winterthur, Schweiz.
authors: V
authors: V
authors: Centmaier-Molnar
authors: Institut für Radiologie und Nuklearmedizin, Kantonsspital Winterthur, 8401, Winterthur, Schweiz.
authors: R
authors: R
authors: Patzwahl
authors: Institut für Pathologie, Kantonsspital Winterthur, 8401, Winterthur, Schweiz.
authors: D
authors: D
authors: Pfofe
authors: Klinik für Orthopädie und Traumatologie, Kantonsspital Winterthur, Brauerstrasse 15, 8401, Winterthur, Schweiz. martin.wiewiorski@ksw.ch.
authors: M
authors: M
authors: Wiewiorski
mesh_terms: D000328:Adult; D001859:Bone Neoplasms / Q000000981:diagnostic imaging* / Q000601:surgery*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008682:Metatarsal Bones / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000601:surgery*; D015831:Osteochondroma / Q000000981:diagnostic imaging* / Q000601:surgery*; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome
keywords: Exostosis; Foot; Metatarsal bone; Neoplasm; Surgery