Figure 6b. (a) Photomicrograph (original magnification, x400; hematoxylin-eosin stain) shows low-grade dysplasia of the neoplastic adenomatous epithelium that lines the distal part of the appendix (arrowhead). (b) Photomicrograph (original magnification, x40; hematoxylin-eosin stain) shows that the neoplastic epithelium consists of a single layer or pseudostratified layer with micropapillary projections (arrow). The abnormal epithelium was con-fined to the appendiceal lumen and did not extend through the wall.