Chronic carpal tunnel syndrome caused by covert tophaceous gout: A case report

Figure 4 Photomicrograph of the surgical field, with the wrist rotated medially. An impressive large mass (3.2 cm in diameter; black arrow) was observed on the ulnar side of the median nerve (MN); in the flexor digitorum superficialis and flexor digitorum profundus tendon sheaths of the middle finger, ring finger; and in the digitus minimus. With the median nerve and flexor tendons protected by the drainage tubes, we observed another large mass (7.0 cm in diameter; white arrows) embedded deep into the distal volar radius. The masses were irregularly shaped and their surface was soft but without inflammation or ulceration.