Sternocostoclavicular hyperostosis is a recently recognized disorder, and is characterized by periosteal and endosteal hyperossification of the sternum, clavicles, and upper ribs, as well as ossification of the surrounding soft tissues. Clinically the patients have pain, swelling, and increased local heat in the upper anterior part of chest. Radilogically there is endosteal or periosteal hyperostosis of the medial portions of the clavicles, the first rib and upper part of the sternum with associated soft tissue swelling and X-ray findings do not change over several years. From June 1986 to September 1989, ten patients in the Orthopaedic Department at Pusan National University Hospital were diagnosed as having sternocostoclavicular hyperostosis and reevaluated in January 1990. The results were as follows:1. Sternocostoclavicular hyperostosis may be more common than has been previously recognized. 2. Men predominated among the young patients, and women among the old patients. 3. The symptoms in the young patients are severer than those in the old patients. 4. The typical clinical and roentgenographic features, including tomography and computed tomography are important in diagnosis. 5. Oral antibiotics are effective in the patients who are ineffective with antinflammatory drugs in relieving the pain.