(osteochondroma, benign) A benign cartiliginous neoplasm arising from the metaphysis of bone.

(osteochondroma) A cartilage capped bony outgrowth of a long bone. Osteochondroma arises on the external surface of bone containing a marrow cavity that is continuous with that of the underlying bone.

(osteochondroma) 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.

(osteochondroma) A common, benign cartiliginous neoplasm arising from the metaphysis of bone. The tumor grows on the surface of the bone; it may be pedunculated or sessile. It is characterized by the presence of chondrocytes, a cartilage cap, and a fibrous perichondrium that extends to the periosteum of the bone. In some cases, there is deletion of 8q24.1 chromosome locus.

Osteochondroma, solitary benign tumour that consists partly of cartilage and partly of bone. Osteochondromas are common and may develop spontaneously following trauma or may have a hereditary basis. No treatment is required unless the tumour interferes with function, in which case it should be...