A) This patient had a bright irregular nerves of normal caliber suggestive of a radiation neuritis treatable with steroids.

B) Hyperintense brachial plexus elements of extremely narrow caliber suggest encircling mechanical entrapment associated with post-irradiation fibrosis. Surgical neurolysis may be helpful.

C) Grossly swollen nerve roots and hydrothorax associated with aggressive tumor recurrence and nerve invasion by tumor.