Synovial chondromatosis is a rare monoarticular disorder which often involves the knee, hip and the elbow but the shoulders are less frequently affected. The diagnosis depends on the important radiographic and operative findings as well as histopathological criteria. We have experienced the synovial chondromatosis developed in the left shoulder of a 37 year-old male who was diagnosed by CT scan, axillary angiography and microscopic findings and treated at Chonbuk National University Hospital.