Figure 4

Unusual/mixed lineage patterns of non-ampullary–duodenal carcinomas: (a) hematoxylin and eosin (left): intestinal-appearing morphology; and immunohistochemical stains: positive for CK7 (middle) and MUC1 (right) markers. (b) Hematoxylin and eosin (left): pancreatobiliary-appearing morphology; and immunohistochemical stains (right): positive for CDX2.