An unfused acromial epiphysis. A reason for chronic shoulder pain.

We report on a case of a 34 year-old female patient who had been suffering from chronic shoulder pain for 2 years although she received conservative treatment. The X-ray revealed a prominent distal clavicle and was interpreted as an old AC dislocation. An axillary view showed an os acromiale. The bone scintigraphy confirmed the clinical suspicion of reaction at the epiphysis. Local corticoid injections improved the patient's condition so that she refused further surgical treatment.