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Acute motor axonal neuropathy (late changes)

(A) C3d deposition on internodal axolemma (arrows). (B) Macrophage in the periaxonal space and lying adjacent to an axon. (C) Left fiber: macrophage (M) surrounding a shrunken but intact axon (A) inside normal-appearing myelin sheath. Right fiber: axon has completely degenerated, and macrophage (M) is occupying its position with normal-appearing myelin sheath. (Contributed by Dr. Kazim Sheikh.)

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