Brachial plexus C5-C8. Pronounced nerve root enlargement, especially C6 with a diameter of 9 mm on the right side. Patient, 47 year old female. Onset of sensory symptoms in her thirties, mostly right arm. Also findings off a very enlarged median nerve on the same side, upper arm 35 mm2 and mid-forearm 25 mm2, wich you can see in the median nerve case files with a more detailed description of the case.