Synovial-filled ganglion cysts associated with labral tears
Type I: clavicle not elevated with respect to the acromion
Type II: clavicle elevated but not above the superior border of the acromion
Type III: clavicle elevated above the superior border of the acromion but the coracoclavicular distance is less than twice normal (i.e. <25 mm)
Type IV: clavicle displaced posterior into the trapezius
Type V: clavicle is markedly elevated and coracoclavicular distance is more than double normal (i.e. >25 mm) - bilateral weight-bearing projections are able to distinguish type V injuries
Type VI: clavicle inferiorly displaced behind coracobrachialis and biceps tendons, which is rare
