Synovial osteochondromatosis (SC) of the shoulder is a rare condition characterized by synovial membrane proliferation and metaplasia, with development of multiple osteocartilaginous nodules: the osteochondromas. Any joint may be affected. The knee is the most frequent site but the shoulder is rarely reported in the literature. It can be divided into primary and secondary forms, which are not clinically or pathologically different. Conventional radiography may be negative in the first stages of the disease, but magnetic resonance imaging and computed tomography are often crucial for early diagnosis, the treatment remains surgical. We presented a 62-year-old women, a case of seropositive rheumatoid arthritis with secondary synovial chondromatosis of the shoulder. Diagnosis is established with the help of Computed tomography and histo-pathological examination.