Carpal tunnel syndrome in bifid median nerve
Clinical diagnosis of carpal tunnel syndrome. NCV - Not done. Referred for Ultrasound of carpal tunnel.
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Early division of median nerve is noted proximal to carpal tunnel.
( Cross sectional area of radial division - 0.8 mm2 ; Cross sectional area of ulnar division - 0.9 mm2 ; Combined cross sectional area - 17 mm2 )
Combine cross sectional area > 11 mm2 is considered abnormal and compatible with carpal tunnel syndrome in a case of bifid median nerve.