Changing the coUrse of cRohn's Disease With an Early Use of Adalimumab

Inclusion Criteria: * Male or female patient aged 18 years old to 75 years old 2. Patient with early luminal Crohn's disease (less than 24 months since diagnosis), 3. Patient who is * intolerant to immunosuppressants or steroids, or * primarily not responders to immunosuppressants for at least 3 months \[azathioprine: at least 2.5 mg/kg/d; 6-mercaptopurine: at least 1.5 mg/kg/d; methotrexate: 25 mg/week (subcutaneous or intramuscular route)\], and/or * not responder to steroids \[prednisolone equivalent at least 40 mg/d\], and/or * steroid-dependent \[unable to reduce corticosteroids below the equivalent of prednisolone 10 mg/d or budesonide \< 6 mg/d within 3 months of starting corticosteroids without recurrent active disease, or who have a relapse within 3 months of stopping corticosteroids\], 4. Patient with CDAI \> 150, 5. Patient with at least one ulcer in at least one affected segment (Magnetic Resonance Imaging (MRI) of gastrointestinal tract or colonoscopy or by video capsule conducted after failure of conventional therapy and within 12 weeks before inclusion in the study), 6. Patient naïve for anti-TNF, 7. Patient whose physician decides to start adalimumab as monotherapy independently from the study protocol, 8. Patient followed in a centre belonging to the GETAID network. 9. Written consent. Exclusion Criteria: * Patient with active complex perianal fistula according to the definition of the American Gastroenterological Association (AGA) \[high anal fistula, abscess, proctitis, multiple external openings\], * Patient with stoma, * previous surgery in IBD * Pregnant or breastfeeding women, absence of contraception * Patient with any contra-indication to adalimumab. * Patient with any contra-indication to MRI * Minors and people unable to give their consent (because of their physical or mental state). * Subject who has not given his/her consent to participate. * Subject participating in another study.