Osteochondroma

**Definition:** A cartilage-capped benign tumor that often appears as a stalk on the surface of bone. It is probably a developmental malformation rather than a true neoplasm and is usually found in the metaphysis of the distal femur, proximal tibia, or proximal humerus. Osteochondroma is the most common of benign bone tumors.

**Tree numbers:** - C04.557.450.565.575.610 - C05.116.099.708.670

**Synonyms:** - Exostosis, Cartilaginous - Exostosis, Osteocartilaginous - Chondrosteoma