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Preoperative radiographs of a right shoulder showing an os acromiale. (A) Anteroposterior view with the site of nonunion (arrow) somewhat visible. (B) Axillary view showing the best visualization of the os acromiale (red dotted line), in this case a meso-type. (Ac, acromion; C, clavicle; G, glenoid; H, humerus; HH, humeral head.)
