Osteochondroma is AN overgrowth of gristle and bone that happens at the top of the bone close to the expansion plate. Most often, it affects the long bones within the leg, the pelvis, or the scapula. nonmalignant neoplasm is that the most typical noncancerous bone growth. It most frequently happens between ages ten and thirty. Osteochondromas square measure the foremost common benign tumors of the bones. The tumors take the shape of cartilage-capped bony projections or outgrowth on the surface of bones exostoses. it's characterised as a sort of overgrowth which will occur in any bone wherever animal tissue forms bone. Tumors most typically have an effect on long bones concerning the knee and within the forearm. in addition, flat bones like the pelvis and os (shoulder blade) could also be affected. Hereditary multiple exostoses typically gift throughout childhood. Yet, the overwhelming majority of affected people become clinically manifest by the time they reach adolescence.  Osteochondromas occur in third-dimensional of the final population and represent thirty fifth of all benign tumors and eight of all bone tumors.