Inflammatory Bowel Disease Cohort in Nantes

This observational study in Nantes, France, follows a large group of patients with inflammatory bowel disease (IBD) — including Crohn's disease, ulcerative colitis, and related conditions — over time. Researchers collect biological samples and clinical data to better understand the disease and improve treatment strategies. **You may be eligible if...** - You are over 18 with a confirmed diagnosis of Crohn's disease, ulcerative colitis, unclassified IBD, or refractory chronic pouchitis - You have active disease requiring surgery or an endoscopy procedure - You have signed informed consent and agreed to biological sample collection for research **You may NOT be eligible if...** - Your IBD is currently in remission (not active) - You have a contraindication to general anesthesia - You are a vulnerable person under legal protection (such as under guardianship) Talk to your doctor to see if this trial is right for you.