Teachable Moment: Median Nerve Ultrasound-Video

Video Transcription

Video Summary

In this clinical vignette, a 33-year-old secretary with numbness and tingling in her hand, worse on the right, presents to the EMG lab. The patient has a positive valence test but normal nerve conduction studies and needle EMG. Ultrasound is performed, and the cross-sectional area of the median nerve at the wrist is normal, but the wrist-forearm ratio is enlarged. This finding suggests carpal tunnel syndrome, despite normal electrophysiologic studies. The ultrasound provided additional useful information for the clinical diagnosis.

Keywords

clinical vignette

numbness and tingling

hand

EMG lab

carpal tunnel syndrome

CTS