Infectious Neuropathies. Sural nerve biopsy in HCV-related anti-MAG neuropathy. Transverse semithin section showing the decreased density of myelinated fibers ((toluidine blue stain, 10x magnification, A). Paraffin-embedded sections disclosing perivascular infiltrates of lymphocytes and monocytes around epineurial arterioles and venules (haematoxylin and eosin stain, 20x magnification, (B)). Electron micrograph showinguncompacted myelin lamellae around a small remyelinating axon (C). D: Electron micrograph showing a myelinated axon with widening of external lamellae of the myelin with increased distance between major dense lines (D). HCV-related central and peripheral nervous system demyelinating disorders: Mariotto S, Ferrari S, Monaco S - Inflammation & allergy drug targets (2014). Not altered. CC.