Fig. 1

Muscle and nerve biopsy did not demonstrate evidence of vasculitis, granulomatous disease, or amyloid. Hematoxylin and eosin (H&E) stained section of skeletal muscle showing grouped atrophy (A); Gömöri trichrome highlights angulated atrophic muscle fibers (B); H&E stained section of peripheral nerve without vasculitis or significant inflammation (C); moderate endoneurial fibrosis on trichrome stain (D); intact myelin on Luxol fast blue stain (E); and preserved axons on neurofilament immunostain (F)