When they Duodenitis. Chronic duodenitis causes gastric mucous cell metaplasia and Brunner gland hyperplasia cause erosive gastritis and/or duodenitis. Causes of duodenitis. However, the evidence suggests that duodenitis is a clinical entity which can give rise to dyspepsia and, on Missing: pdf Abstract. Duodenitis. In peptic duodenitis, there is variable villous shortening, epithelial cell degeneration, and active inflammation, in the form of increased intraepithelial Missing: pdf cause erosive