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Osteochondromas are common primary bone tumors which are usually found in the metaphyseal region of tubular long bones. The distal femur, proximal tibia and the proximal humerus account for 90% of the common sites of occurrence. Their occurrence in flat bones such as the pelvis and the scapula are rare and constitute only 3-4% of all osteochondromas. While the scapula is rarely involved, this is the most common tumor of the scapula. Clinical signs of this lesion include shoulder pain and limited range of motion. This tumor may also present with winging of the scapula. We report a case of a 15-year-old girl presenting with a large sessile osteochondroma of the scapula causing pain on shoulder movements. While osteochondromas of the scapula are rare, it is important to recognise that the most common benign bone tumor of the scapula is an osteochondroma. Due to the unusual location with unspecific shoulder pain, the diagnosis may be hindered. Osteochondromas may have different symptoms depending on their location. Good functional outcomes can be expected following excision of scapular osteochondromas as evidenced by this patient. The prognosis is mostly excellent following excision, but the possibility of recurrence must be kept in mind if the excision is inadequate.

A rare localization of a sessile osteochondroma on the scapula causing shoulder pain in an adolescent girl