Carpal tunnel syndrome - with inverted notch sign
Symptoms of carpal tunnel syndrome. Referred for evaluation of carpal tunnel evaluation.
Loading Stack -
0 images remaining
There is oedematous median nerve distal to carpal tunnel. The cross-sectional area of nerve proximal to the tunnel - 10 mm. The cross-sectional area of nerve distal to the tunnel - 21 mm.
There is no tenosynovitis/tendinosis/ganglion cyst.
In carpal tunnel syndrome, there is median nerve compression resulting in the nerve edema ( increased cross-sectional area ). If the maximum cross-sectional area of the nerve is near the proximal end of the carpal tunnel, it is called a notch sign. And when the maximum cross-sectional area is distal to the carpal tunnel, it is called an inverted notch sign.
- Ultrasound of the Musculoskeletal System. S. Bianchi C. Martinoli 1st Indian Reprint 2007.