Inflammatory bowel disease (IBD) represents a group of chronic inflammatory disorders involving the colon, small intestine (SB) and the entire gastrointestinal tract and includes Crohn's disease (Crohn's disease), ulcerative colitis (UC). ) and unclassified entities . Crohn's disease Crohn's disease is an immune-mediated chronic inflammatory disease that usually involves the ileum and terminal colon, but at the time of diagnosis it may be confined to the small intestine, as is seen in about 30% of patients. patients with Crohn's disease, especially younger patients.