Unfortunately, the assessment of mucosal healing by conventional ileocolonoscopy is not complete since it does not allow exploration of the small bowel beyond TI. Thus, while mucosal changes and symptomatic improvement in subjects with SB Crohn's disease (with or without colonic involvement) can be inferred from studies like ACCENT I, direct evidence of the healing of the majority of the small bowel is lacking. In addition, correlation between evidence of mucosal healing and symptoms, as measured by the Crohn's Disease Activity Index (CDAI), has not been found reliable. This may reflect the limitation of viewing the full extent of small bowel ulcerations on the limited examination which is possible with ileocolonoscopy. This may potentially be overcome with the use of capsule endoscopy of the small bowel.