osteochondromatosis

osteochondromatosis A condition that is characterized by multiple benign tumors of cartilage, called osteochondromas, projecting from bone, most often from near the ends of long bones. In a small proportion of cases, an osteochondroma may become malignant. Also known as multiple exostoses. The condition can be hereditary, in which case it is called hereditary multiple exostoses (HMS).