A 44-year-old woman complained of right shoulder pain 6 years after undergoing surgery, chemotherapy, and radiation treatment for metastatic melanoma involving right axilla. A, Anteroposterior radiograph of right shoulder revealing very subtle bony sclerosis along the lateral aspect of scapula. B, T2-weighted axial MRI demonstrating aggressive appearing lesion with large soft-tissue mass. Biopsy showed that the lesion was a conventional osteosarcoma. C, Right shoulder after chemotherapy and scapulectomy.