ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Benign bone tumour. Profile (left) and frontal (right) X-rays of an osteochondroma, a benign (non-cancerous) tumour of bone cells (osteoclasts), that has grown at the end of the radius (one of the forearm bones). Osteochondroma occurs most often during the first two decades of life. Typical sites are the long bones of the legs and arms. Although it is not usually a dangerous condition in itself, an osteochondroma may have to be removed if it causes pain or affects mobility. An inherited form with multiple growths, which is called multiple heritable exostoses, may progress to a malignant bone cancer (chondrosarcoma).
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