A number of studies indicate that mucosal healing is a good predictor of long term remission. In particular, intense therapeutic regimens including purine analogues and biologic therapies like infliximab have been associated with endoscopic mucosal healing. The recently published SONIC trial evaluated the efficacy of infliximab monotherapy, azathioprine monotherapy and the two drugs combined in moderate to severe Crohn's disease patients. Patients who were treated with infliximab monotherapy and with the combination therapy had significantly longer corticosteroid-free clinical remission than those receiving azathioprine alone. Furthermore, mucosal healing, defined as the absence of mucosal ulcerations at week 26, was greater for the combination therapy than each of the monotherapies alone. Based on the results of these studies, obtaining a mucosal healing becomes in clinical practice a new therapeutic objective especially in patients treated by immunosuppressors or anti-TNF-alpha antibodies. In most of the studies, a complete mucosal healing was assessed by the complete disappearance of ulceration. An endoscopic response could be evaluated by the variation of several endoscopic scores of severity, that are either dedicated to the terminal ileon (TI) more the colon i.e. the Crohn's disease endoscopic severity index (CDEIS) or to the SB i.e. the Lewis score. Concerning the evaluation of the mucosal lesions of the SB by the capsule, a new index of severity is being developed in a study conducted by the different centers of the GETAID i.e. the CE-CDEIS. This score will be available in the first semester of 2013 and would be usable for the present study.