A rare sessile variant of osteochondroma presenting at an unusual site of the iliac wing in a 15-year-old boy

Osteochondromas rarely grow from flat bones such as scapula and pelvis. These tumors grow in sync with the growth of the child. They usually involve the growing ends of long bones, more commonly the distal end of the femur. We report a 15-year-old boy presenting to us with an osteochondroma of the iliac wing. It was a rare sessile variant. The tumor was causing him extreme pain and mechanical block to squatting, sitting cross-legged, and walking. The tumor was surgically removed by extraperiosteal resection. The patient was followed up for 1 year. He did not suffer from a recurrence or symptoms of pain or weakness after 1 year. Pelvis forms an unusual site of presentation for an osteochondroma. These tumors, should they arise from the pelvis, are notoriously dangerous as they may cause compression of lumbar nerve roots. Complete removal of these tumors extraperiosteally gives a drastic relief to the patient's symptoms. The patient should be followed up carefully to look for recurrence of this tumor.