<unk>  (also known as "osteocartilaginous exostosis") is a benign bone tumor that consists of cartilage and bone.<unk> s arise from cartilage, which is normally involved in the mechanical support of the bone. These tumors take the form of cartilage-capped bony projections or outgrowth on the surface of bones, also known as exostoses.<unk>  is the most common benign bone tumor and usually occurs in the metaphyseal region of the long bones.<unk> s may be classified into 2 subtypes: solitary<unk> s (non-hereditary) and multiple<unk> s (hereditary); the majority of these tumors present as solitary lesions (85%). Development of<unk> s is the result of the developmental anomaly of skeletal growth. Genes involved in the pathogenesis of<unk>  include EXT1 and EXT2 genes.<unk>  is associated with a number of syndromes that include Langer-Giedion syndrome, Potocki-Shaffer syndrome, and metachondromatosis syndrome.<unk> s are usually found in adolescents and children. Males are more commonly affected with<unk>  than females. The incidence of<unk>  is approximately 0.9 per 100,000 individuals. If left untreated, progression occurs slow and is then followed by malignant transformation. The treatment choice for<unk>  is surgical removal of solitary lesion or partial excision of the outgrowth.
Osteochondroma
Osteochondrosis
Osteoma
Osteoblastoma
Osteoid osteoma
Osteosarcoma
Synovial sarcoma
Aneurysmal bone cyst