A 14-year-old boy with massive osteolysis of the right scapula was treated by irradiation with a total dose of 58 Gy, using cobalt 60 (2 Gy per fraction) in 1983 and 1984. Histopathology in a biopsy specimen revealed hemangiomatosis associated with few osteoclasts and a lining of oval or spindle-shaped endothelial-like cells. The osteolysis has been interrupted since the last irradiation. In January 2000, 17 years after the initial treatment, the patient is working as a public officer, and shows no clinical signs of postradiation sarcoma. Radiographs show a residual scapula with sclerotic margin, associated with marked hypoplasia and atrophy of the right humerus. Ranges of motion of the right shoulder are 100° on anterior elevation, 40° on posterior elevation, and 70° on abduction. The patient experiences no problems in daily living, except for difficulty in lifting.