This helps differentiate osteochondroma from the other forms of exostosis as well as diverse bone-forming surface lesions such as osteoma, bizarre parosteal osteochondromatous proliferation, periostitis ossificans, and parosteal osteosarcoma. Osteochondroma is the most common of all exophytic bone lesions and a useful distinguishing feature is the radiographic identification of continuity of the marrow and cortex with the underlying bone. The term is synonymous with osteochondroma, also known as cartilage-capped exostosis, but is also used with other bony excrescences such as subungual exostosis and turret exostosis. An exostosis is defined as a benign outgrowth of bone projecting from the outer cortex.
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