Carpal Tunnel Syndrome with Wrist Trigger Caused by Hypertrophied Lumbrical Muscle and Tenosynovitis

Figure 1

Magnetic resonance imaging of the wrist. (a) T2-weighted coronal image. Edematous lumbrical muscle with synovial proliferation (white arrow) was seen around the flexor tendons. T: trapezium, S: scaphoid, P: pisiform. (b) T2-weighted axial image. The median nerve () was compressed between the transverse carpal ligament (white arrow heads) and the edematous synovial tissue (white arrow) around the flexor tendon.

(a)

(b)