A well-defined, mildly expansile lesion is observed in the distal clavicle approximately 1cm proximal to the distal articular surface. The lesion is soap-bubbly in appearance with mild cortical thinning. There is no evidence of cortical violation or overlying periosteal reaction.
Overall bone density appears moderately diminished. The acromioclavicular joint appears widened, with an indistinct distal clavicular articular surface. The cortex along the medial aspect of the humeral neck appears thinned and feathery on the external rotation view.