non-contiguous

In Crohn's disease, inflammation occurs in a 'skip lesion' or non-contiguous pattern, meaning diseased segments of the gastrointestinal tract are separated by normal, unaffected bowel. This can affect any part of the GI tract from mouth to anus, with the terminal ileum and colon being most commonly involved. This contrasts sharply with ulcerative colitis, which shows continuous, contiguous involvement starting from the rectum and extending proximally without skip areas. The non-contiguous nature of Crohn's disease has important clinical implications: it complicates surgical management since removing one affected segment does not prevent disease recurrence elsewhere, and it makes endoscopic and radiographic diagnosis more complex as multiple separate strictures, fistulas, or ulcerations may be present. Pathologically, Crohn's shows transmural inflammation with granulomas (noncaseating) in a discontinuous pattern, while UC shows mucosal/submucosal inflammation in a continuous pattern. The term is also used more broadly in pathology and radiology to describe any skip-pattern involvement, such as in certain vasculitides, osteomyelitis, or metastatic spread patterns, where lesions are separated by normal intervening tissue rather than being confluent.