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Immunoproliferative small intestinal disease (IPSID). (A,B) Double-balloon endoscopy showing villous edema in the ileum. (C) A biopsy specimen revealing blunting of the villi. (D,E) A dense lymphoplasmacytic infiltrate detected. (F,G) The tumor cells are positive for CD138 (F) and IgA (G). Original magnification: ×25 (C), ×100 (D), and ×400 (E–G).
