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Symptomatic side shows absence of ulnar collateral ligament in normal location. There is a hypoechoic pseudomass formation proximal to joint line; abutting metacarpal bone. There is no associated bone flake avulsion or defect in phalanx base. There was no sesamoid fracture at thumb. Flexure and extensor tendon were normal.
Asymptomatic side shows normal position and echopattern of ulnar collateral ligament.