PatternInterpretation
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