Pyloric reflux gastritis: the offending agent.

Tubes of canine gastric corpus were constructed so that the mucosa was exposed chronically to jejunal contents, pancreatic juice, or bile. Biopsies of these mucosae obtained 4 to 24 months later were compared with each other and with the normal stomach for parietal cell numbers, mucus cell numbers, inflammation, glandular disorder, and surface-cell hyperplasia. All three preparations showed marked gastrititis, but whole jejunal contents caused more severe changes than did either pancreatic juice or bile, which were approximately equal.