Helicobacter-pylori associated duodenitis

**Definition:** Duodenitis with Helicobacter pylori infection. H. pylori can be colonized on gastric metaplasia epithelium at bulb, and induce duodenitis.

**Exclusions:** - Helicobacter-pylori associated and drug-induced duodenal ulcer - Helicobacter-pylori associated duodenal ulcer