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Complications after carpal tunnel surgery. Axial sonograms obtained from proximal (a) to distal (b) in a patient with hypoesthesia of the thenar em.inence. a shows the normal appearance of the median nerve (arrow) and its palmar sensitive branch (arrowhead). More distally (b), the palmar branch is swollen and hypoechoic (black arrowhead) because of the formation of a posttraumatic neuroma. RA radial artery, FCR flexor carpi radialis, FPL flexor pollicis longus
