Congenital bilateral absence of the acromion. A case report.

Complete bilateral absence of the acromion, a condition not previously reported by others, was discovered in a 31-year-old housewife who had shoulder pain. Clinically, no abnormal physical sign was noted in the patient except for mild superior translation of the humeral heads. Radiographs showed bilateral absence of the lateral aspect of each scapular spine and acromion. The lateral ends of both clavicles were hypertrophied with convex and blunt margins. Even in the absence of the acromion, there was no significant clinical dysfunction of the shoulder joint.