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Microscopic findings of the tumor. Hematoxylin and eosin staining showed poorly differentiated malignant cells suggestive of adenocarcinoma (A, ×100; B, ×400). Positive staining of the tumor cells for (C) cytokeratin 7 (×100) and (D) cytokeratin 19 (×100) was seen on immunohistochemical examination.
