Presentation
Clinical diagnosis of Bilateral carpal tunnel syndrome. B/L NCV positive for CTS (right > left).
Patient Data
Age: 45
Gender: Female
From the case:
Carpal tunnel syndrome
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Right - Maximum cross sectional area of nerve just proximal to tunnel - 19 mm2
Left median nerve is bifid. Radial division is larger than ulnar.
Left - Bifid nerve - Maximum combined cross sectional area of nerve just proximal to tunnel - 11 mm2
No mass lesion / tenosynovitis on either side.
Case Discussion
10 mm2 is commonly considered upper normal limit for non-bifid median nerve cross sectional area.
11 mm2 is commonly considered upper normal limit for bifid median nerve cross sectional area.