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  • Title: Concurrent periosteal chondroma and enchondroma of the fibula mimicking chondrosarcoma.
    Author: Yamamoto Y, Washimi O, Yamada H, Washimi Y, Itoh M, Kuroda M.
    Journal: Skeletal Radiol; 2006 May; 35(5):302-5. PubMed ID: 16421751.
    Abstract:
    We present a rare concurrence of enchondroma and periosteal chondroma in the right distal fibula that mimicked chondrosarcoma in a 13-year-old boy. Radiographs and CT scans showed a periosteal lesion producing saucerization without periosteal reaction and calcification in the distal metaphysis of the right fibula. MRI showed an intramedullary lesion adjacent to the periosteal lesion, although it was invisible at CT. There was no cortical breach on imaging and gross examination. Because both lesions represented benign cartilaginous tumors on histology, concurrent periosteal chondroma and enchondroma of the fibula was diagnosed. This combination in the same bone in a patient without enchondromatosis is exceedingly rare. Such imaging features may be confused with those of chondrosarcoma.
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