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Major histologic types of ampullary carcinoma. A. Intestinal type (hematoxylin and eosin, original magnification 200×); B. Pancreatobiliary type with conventional pancreatic ductal adenocarcinoma morphology (hematoxylin and eosin, original magnification 100X); C. Invasive papillary adenocarcinoma, pancreatobiliary type (hematoxylin and eosin, original magnification 100×).
