Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed
Due to a beaked failure of constriction with cortical overgrowth adjacent to the growth plate with subsequent eccentric bony growth from this beak in a direction away from the joint forming a tumor like excrescence that continues to grow until the growth plate closes. It is the most common skeletal tumor in childhood. Malignant degeneration occurs in 2-10% of cases, and should be suspected if there is rapid increase in size of an exostosis, especially in an adult.
Most frequently seen in long tubular bones such as the distal femur, proximal tibia, proximal ulna, proximal femur, and distal forearm. Appears as a cystic excrescence projecting away sfrom the metaphysis that has its axis pointing away from the joint.
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