Pattern

Interpretation

Site(s) involved by disease Ileum Caecum Ascending colon Transverse colon Descending colon Sigmoid colon Rectum Anatomical distribution of disease Continuous/segmental/single site Intrasite distribution of disease Diffuse/patchy/focal/combinations Activity Degree of maximum activity None/mild/moderate/severe Site(s) involved by activity Ileum Caecum Ascending colon Transverse colon Descending colon Sigmoid colon Rectum Site(s) of maximal colorectal activity Caecum Ascending colon Transverse colon Descending colon Sigmoid colon Rectum

IBD—probability IBD definite or very likely/IBD favoured over other causes/no evidence of IBD Subcategory of IBD, if appropriate UC definite or very likely/UC favoured/IBDU/CD favoured/CD definite or very likely/no subcategory Dysplasia Dysplasia—maximum grade None/low grade/high grade/indefinite Sites involved by low-grade dysplasia Caecum Ascending colon Transverse colon Descending colon Sigmoid colon Rectum Sites involved by high-grade dysplasia Caecum Ascending colon Transverse colon Descending colon Sigmoid colon Rectum Codes ▸ A0/A1/A2/A3 ▸ IBD-DVL/IBD-F/IBD-0 ▸ UC-DVL/UC-F/IBDU/CD-DVL/CD-F/none ▸ D0/DL/DH/DI