FIGURE 1

Autoimmune gastritis. Diffuse mononuclear infiltrates within the lamina propria that are heavier in the deeper, glandular portions (A). Patchy lymphocytic infiltrates and damage to oxyntic glands (B). Parietal cell pseudohypertrophy with “snouting” resulting from luminal cytoplasmic projections (C). Metaplastic epithelium of the intestinal (D), pyloric (E), and pancreatic acinar types (F). Linear enterochromaffin cell-like cell hyperplasia on hematoxylin and eosin stain (G) and with chromogranin stain (H).