Fig. 7From: A panorama of radial nerve pathologies- an imaging diagnosis: a step aheada Normal posterior interosseous nerve can be seen winding around the radial head, passing between two heads of the supinator (s) in to the forearm. The nerve is of normal calibre and echogenicity (A,B,C and D). b Just distal to 7a, focal increase in calibre and hypo-echogenicity (marker A) is noted in PIN. c Intraoperative picture of PIN (arrowhead) after release of nerve from surrounding local scar tissueBack to article page