Gout.

Characteristic imaging finding of chronic gout include eccentric soft-tissue abnormalities, sometimes calcified, that have overly well defined erosions with sclerotic margins and overhanging edges, and preservation of bone density. While the triad of acute monoarticular arthritis, hyperuricemia, and prompt response to drug therapy is highly suggestive of acute gouty arthritis, the radiographic findings during an acute attack are nonspecific.