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Adenocarcinoma with enteroblastic differentiation is an extremely rare tumor with poor prognosis and unique pathologic features. The tumor appears to be relatively more common in stomach, with rare cases reported in esophagus, colon, rectum and ampulla. Underrecognition by pathologists may be a contributing factor towards underreporting of this tumor. Combination of carcinosarcoma and enteroblastic differentiation has not been reported so far.We report a unique case of ampullary carcinosarcoma with enteroblastic differentiation in a 59-y