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What Is Exostosis?

Exostosis of the bone.

The most common type of noncancerous bone tumor, in which there is an outgrowth of bone tissue. Exostosis develops most commonly at one end of the femur (thigh bone) of the tibia (shin). The condition may be due to hereditary factors or to prolonged pressure on a particular bone.


In most cases, exostosis produces no symptoms. Often it is recognized only after an injury, when it appears as a hard swelling. Occasionally, the tumor presses on a nerve, causing pain or weakness in the affected area.


Diagnosis can be confirmed by X-rays. The tumor may be surgically removed if it is causing symptoms or for cosmetic reasons.

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