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Histological diagnosis of IPMC. Hematoxylin and eosin stain. The primary tumor shows intraductal papillary growth (A). The arrow indicates malignant features (B) and invasive ducts (C) (original magnifications ×40, ×100, and ×200, respectively). The IPMC xenograft tumor reveals features similar to those of a moderately differentiated adenocarcinoma (D; original magnification ×100).
