Ultrasound scanning.

<p>While the fingers performed active flexion and extension movements (a), the transverse sliding motion of the median nerve within the carpal tunnel was clearly identified in dynamic B-mode images. (b), (c) & (d) Representative US images obtained from normal subjects and mild- and severe- CTS patients, respectively. Note that the amount of transverse sliding of the median nerve varied with the severity of CTS. N indicates the median nerve. Normal, Mild, and Severe indicate normal subjects, mild-CTS and severe-CTS patients.