The median nerve maximum cross-sectional area proximal to the carpal tunnel is 12.4 mm2. The maximum cross-sectional area distal to the carpal tunnel is 11.1 mm2. There was no mass lesion involving the median nerve.
A thin-walled anechoic lesion deep to the flexor tendons in the carpal tunnel region. Its bulbous part is outside the distal end of the tunnel. Its neck extends along the carpal tunnel floor and appears to enter the intercarpal joint. The lesion measures 21 (length) x 15 (width) x 7 (anteroposterior) mm.
Normal flexor tendons without tenosynovitis.
A clinically palpable nodule on the volar-radial side of the wrist is a thin-walled anechoic cyst (6 x 6 x 3 mm) outside the carpal tunnel. It abuts the flexor carpi radialis, and its neck is close to the scaphoid-trapezium joint.
There was no other wrist abnormality.