Postbulbar Duodenal Ulceration and Stenosis: definition Posted by: Cleo Libonati, RN, BSN in DICTIONARY 0 2,335 Views A chronic inflammatory disorder characterized by thickening of the intestinal lining with excoriation penetrating the muscularis mucosae (muscle layer of the intestine) associated with villous atrophy. Click for full description. Duodenum Glossary. Inflammatory Disorder Postbulbar Duodenal Ulceration and Stenosis Ulceration 2013-04-13 Cleo Libonati, RN, BSN