Gout is a disorder of urate metabolism that leads to high levels of uric acid and the formation of urate crystals. Urate crystals can be deposited under the skin, in joints, and within tendon sheaths as gouty tophi, which can cause an intense inflammatory process. Panel A demonstrates the clinical appearance of gouty tophi. Panel B illustrates the radiographic appearance of gouty tophi. Note the multiple juxta-articular, punched-out lytic erosions (red circles) and a lack of osteoporosis, which is characteristic of gout.
