الفهرس 
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Abstract
Ultra-sonography is a simple technique to evaluate the median nerve and contents of carpal tunnel. The anatomy of median nerve can be clearly defined and accurate measurements of its dimensions can be obtained. The abnormalities of median nerve, including edema, contour abnormalities and cross sectional area can be determined by USG. With our experience we found it easier to evaluate the medial nerve in the carpal tunnel in the disto‑proximal sequence by identifying the FPL first with dynamic evaluation. As the percentage of space occupying lesions causing symptoms in unilateral (atypical) carpal tunnel syndrome is 35%, we highly recommend this preoperative investigation in all unilateral carpal tunnel syndrome patients. High frequency USG has emerged as a reliable modality in carpal tunnel syndrome, more so because it’s non‑invasive and accurate.