Fig. 2From: Comparative study between blind and ultrasound-guided steroid injection for carpal tunnel syndromeUltrasound image of the median nerve (dashed arrow) of a 52-year-old patient with moderate CTS treated with ultrasound-guided injection. Before injection. CSA and FR were 15 mm2 and 2.55 (left image), which improved to 9 mm2 and 1.55, respectively, 4 weeks after injection (right image)Back to article page