Carpal tunnel syndrome
Clinical diagnosis of Bilateral carpal tunnel syndrome. B/L NCV positive for CTS (right > left).
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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.
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.
- Reproducibility of Sonographic Measurements of the Median Nerve. Luis Alemán, MD, Juan D. Berná, MD, Manuel Reus, MD, Francisco Martínez, MD, Ginés Doménech- atto, MD, Matilde Campos, MD J Ultrasound Med 2008; 27:193–197 2.Bifid Median Nerve in Patients With Carpal Tunnel Syndrome Ilkay Koray Bayrak, MD, Ayse Oytun Bayrak, MD, Melike Kale, MD, Hande Turker, MD, Barıs Diren, MD J Ultrasound Med 2008; 27:1129–1136