Entero-MRI is indicated in Crohn's disease as part of the initial work-up or follow-up (to assess response to treatment, complications). The protocol for carrying out the examination complies with precise specifications set out in international recommendations. To perform the test, the small intestine must be distended with a hyperosmolar product. This protocol is applied to all patients, with no distinction or adaptation. The total duration of the examination is sometimes difficult for patients to bear. Ingestion of the product to obtain distension of the small intestine is often poorly tolerated by patients. In a number of cases, the entero-MRI may have been normal due to symptomatology regression or other diagnosis. The patient therefore underwent a complete examination similar to that of a patient with a pathology requiring characterization. In this context, the investigators hypothesize that fast MR sequences are sufficient to discriminate between normal and abnormal examinations.