Clinical Challenges and Complications of IBD

Miguel D Regueiro, MD; Jason Swoger, MD MPH

Chapter 1: Upper Gastrointestinal Tract Crohn’S Disease (continued)

Mark Lazarev, MD; Jemilat O. Badamas, MD

Upper gastrointestinal (UGI) Crohn’s disease (CD) refers to disease found in the esophagus, stomach, jejunum, or proximal ileum. The original Vienna classification of CD location designated L1 disease as terminal ileal, L2 as colonic, L3 as ileocolonic, and L4 as UGI disease.1 However, the vast majority of patients with UGI disease also have concurrent distal disease. The Vienna classification was not able to appropriately categorize these patients. More recently, the Montreal Working Party reclassified L4 disease such that it can be separately added to any other established location…