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A 5-year-old 520-kg (1,144-lb) Thoroughbred racehorse gelding was evaluated because of a history of forelimb lameness and swelling in the carpal area. On physical examination, all vital sign values were within reference ranges; however, there was a moderate amount of effusion within the right antebrachiocarpal joint. Lameness examination revealed a grade 3 of 5 right forelimb lameness; upper limb flexion exacerbated the lameness. Standard and nonstandard radiographs of the right carpus were obtained (
Dorsal 70° medial-palmarolateral oblique (A; 20° angle from lateral), dorsal 45°