1. A critical clinical issue is whether isolated ileitis in asymptomatic patients is a manifestation of early Crohn disease.

2. Patients with fistulising Crohn s disease with acute suppurative fistulas must not initiate Remicade therapy until a source for possible infection, specifically abscess, has been excluded (see section

3. Backwash ileitis: involvement of the terminal ileum by the inflammatory and ulcerative changes seen in chronic ulcerative colitis; distinguished from involvement of ileum and proximal colon by regional (granulomatous) enteritis (for example, Crohn disease of terminal ileum and proximal colon).