• Foot Ankle Int · May 2000

    Case Reports

    Bizarre parosteal osteochondromatous proliferation (Nora's lesion) of the sesamoid: a case report.

    • J A Harty, P Kelly, D Niall, J C O'Keane, and M M Stephens.
    • Cappagh Orthopaedic Hospital, Finglas, Dublin, Ireland.
    • Foot Ankle Int. 2000 May 1; 21 (5): 408-12.

    AbstractWe report the a case of Nora's lesion (Bizarre Parosteal Osteochondromatous Proliferation) of the sesamoid. A 32-year-old woman presented with a painless, enlarging mass of two years duration on the plantar aspect of the first metatarsophalangeal joint of the left foot. Radiographs, Computerized Tomographs and Magnetic Resonance images, initially suggested a parosteal osteosarcoma arising from the tibial sesamoid. The mass was excised, and a histological diagnosis of Bizarre Parosteal Osteochondromatous Proliferation of bone (Nora's lesion) was made. The aggressive growth of this lesion may suggest a neoplasm clinically. Histological features, however, are those of a reactive lesion.

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