Introduction

Ultrasound of the median nerve is especially important in PMR when symptoms arise around the carpal tunnel, forearm, or cubital fossa, because it quickly shows nerve caliber change, loss of fascicular pattern, and the nerve's relation to nearby tendons and retinaculum. It helps distinguish carpal tunnel syndrome from more proximal compression, detect inflammatory or post-traumatic changes, and better guide rehabilitation, injection, or surgical planning. Another major advantage is dynamic comparison with the contralateral side and continuous tracking of the nerve across high-risk segments, where compression may occur not only in the carpal tunnel but also more proximally near the pronator teres or lacertus fibrosus.