Table 2.
Suggested MRE parameters for the development of a qualitative index of Crohn's disease inflammatory activity.
| Parameter | Score | |||
|---|---|---|---|---|
| 0 | 1 | 3 | ||
| Wall thickness | 1-3 mm | > 3-5 mm | > 5-7 mm | > 7 mm |
| Wall signal intensity on T2-weighted images | Equivalent to that of a normal loop | Slight signal increase (dark gray) | Moderate signal increase (light gray) | Marked signal increase (white, similar to that of the luminal content) |
| Perimural signal intensity on T2-weighted images | Similar to normal mesentery | High, without fluid | Small (< 2 mm) fluid collection | Large (> 2 mm) fluid collection |
| Wall enhancement pattern | - | Homogeneous | Mucosal | Delaminated |
| Wall enhancement | Similar to that of the normal bowel | Sight increase (less than that of the vessels) | Moderate increase (but still less than that of the vessels) | Marked increase (similar to that of the vessels) |
| Lymph nodes | Absent | Clusters of lymph nodes < 1 cm | One lymph node > 1 cm | Three lymph nodes > 1 cm |
| Lymph node enhancement | Less than that of the vessels | Equivalent to or greater than that of the vessels | - | - |
| "Comb sign" | Absent | Present | - | - |