 |
| Age at diagnosis |
| A1 ¡Â 16 years |
| A2 17 ~ 40 years |
| A2 £¾ 40 years |
|
|
| Location |
|
L1 Terminal ileum (the lower third of the small bowel with or without spill over into cecum)
|
|
L2 Colon
|
|
L3 Ileocolon (terminal ileum + any location between ascending colon and rectum)
|
|
L4 Isolated upper disease (a modifier that can be added to L1-L3 when concomitant upper gastrointestinal disease is present)
|
|
|
| Behavior |
|
B1 Nonstricturing nonpenetrating
|
|
B2 Stricturing
|
|
B3 Penetrating
|
|
p perianal disease modifier (added to B1-B3 when concomitant perianal disease is present)
|
|
|
