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Duodenal major papillae and ampullary biopsy showing mucosal ulceration (a, b, arrows), vasculitis (c, left, arrows), thrombi (c, right arrows), smudge nuclei (c, left, and d, arrow heads) and ganglions involved by the inflammation (d, arrows) (a-d, H&E stains; a, × 100; b-d, × 400).
