NCIt definition : A small, benign bone-forming neoplasm that can arise from any bone but more frequently
affects the long bones. The central portion of the neoplasm (nidus) contains differentiated
osteoblasts that produce osteoid and sometimes bone. The lesion is usually surrounded
by hypervascular sclerotic bone and has limited growth potential. Clinical signs and
symptoms include pain and localized tenderness, at the site of the lesion. The pain
may be intense but in the majority of cases it is completely alleviated by non-steroidal
anti-inflammatory drugs. Prognosis is excellent and recurrences are rare.;