Figure 1.

A. Infiltrative endometrioid adenocarcinoma of the ileum (hematoxylin-eosin stain, 100×). B. Cytokeratin 20 immunostaining negative (100×). C. Cytokeratin 7 immunostaining positive (100×). D. Cecum intraparietal benign endometriosis (hematoxylin-eosin stain, 100×).