Primary tumors and tumor-like lesions of the clavicle.

Fifty eight patients seen at Memorial Sloan-Kettering Cancer Center over a 50-year period were reviewed for lesions of the clavicle. A variety of malignant neoplasms, benign neoplasms, and tumor-like lesions were seen. There were 30 malignant neoplasms, the commonest of which were plasmacytomas, osteosarcomas, and Ewing sarcomas. There were five postradiation sarcomas. An unusual granulocytic sarcoma with dense sclerosis was described. Among the benign lesions were two osteochondromas, two hemangiomas, and a giant cell tumor secondary to Paget disease. The tumor-like lesions included six aneurysmal bone cysts and five eosinophilic granulomas. There were two patients with chronic sclerosing osteomyelitis and one each with sternocostoclavicular hyperostosis (Sonozaki syndrome) and condensing osteitis. An unusually large lesion of pseudogout and a large brown tumor were also included in the series.