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Well defined "punched out" erosive changes with sclerotic margins in a marginal and juxta-articular distribution and overhanging edges "rat bite erosions" of the head of the first metatarsal bone and around the interphalangeal joint of the big toe
Periarticular hyperdense soft tissue swelling "tophi" is seen.
Diffuse degenerative and osteoprotic changes are also noted.
Findings are typical of gout arthritis.