Table 1.
Ultrasound variables that were eligible for inclusion in the ultrasonographic activity score for Crohn’s disease: the definition and score characteristics are presented for each variable.
| Score | ||||
|---|---|---|---|---|
| Variable | 0 | 1 | 2 | 3 |
| Bowel wall thickness (mm) | <3.0 | 3.0–4.9, or 4.0–4.9 mm [rectum] | 5.0–7.9 | ≥ 8.0 |
| Stenosis | None | Suspected [thickened wall with narrow lumen] | Suspected several per segment | Suspected with pre-stenotic dilatation [> 2.5 cm] |
| Length of affected segment (cm) | None | <5 | 5–10 | >10 |
| Colour Doppler score | No or single vessel | 2–5 vessels per cm2 | >5 vessels per cm2 | |
| Stratification | Normal | Focal loss | Diffuse loss | |
| Fatty wrapping | Absent | Present | ||
| Fistula | Absent | Present | ||