* Extracolonic features would include but are not limited to musculoskeletal (e.g. arthritis), ocular (e.g. uveitis, episcleritis etc), dermatological (e.g. pyoderma gangrenosum, erythema nodosum etc), oral (aphthous stomatitis).

Journal of Crohn's and Colitis, 2018, 273–290 doi:10.1093/ecco-jcc/jjy114
ECCO-ESGAR Guideline for Diagnostic Assessment in IBD Part 2: IBD scores and general principles and technical aspects