Fig. 4From: Comparative study between blind and ultrasound-guided steroid injection for carpal tunnel syndromeUltrasound image of the median nerve (dashed arrows) of a 49-year-old patient with mild CTS treated with blind (non-guided) steroid injection. Median nerve CSA and FR before (left image) and 4 weeks after steroid injection (right image). Ultrasonographic improvement was recorded as a slight decrease in CSA (11 mm2 vs. 12 mm2) and FR (2.73 vs.2.95)Back to article page