Exostosis - Definition

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Exostosis is a benign bone tumor that appears as a new formation on the surface of a normal bone. It can be isolated and involve only a single location with a single bone, or affect many bones: this is referred to as osteogenic disease or hereditary multiple exostosis. This genetic disease can be damaging by the occurrence of shortening or deformation of certain bones. The ulna is most frequently affected and curves. Exostosis also poses a risk of bone cancer.