Table 1.
Types of classifications used to study the prognostic significance of T2-weighted increased signal intensity (ISI) on MR images of patients with CSM
| Code | Type of classification and basis of classification | Grade/type | Description |
|---|---|---|---|
| Longitudinal extent of ISI | |||
| L133 | Actual number of segments involved | 0–4 | |
| L22,3,4,8,9,25,26,30,31,37 | One or more segments | 0 | No ISI |
| 1 | Focal/single segment ISI | ||
| 2 | Multisegmental ISI | ||
| L332 | With T1-weighted changes | 1 | 1 disc space + normal T1W image |
| 2 | >1 disc space + normal T1W image | ||
| 3 | T1W hypointensity | ||
| Qualitative | |||
| Q133 | Marginal pattern of ISI | 1 | Localized |
| 2 | Diffuse | ||
| Q236 | ISI delineation | 0 | No signal change |
| 1 | Diffuse signal change | ||
| 2 | Focal signal change | ||
| Q32,5,10,13,34,35 | ISI intensity and border | 0 | No change |
| 1 | Faint, fuzzy border | ||
| 2 | Intense, well-defined border | ||
| Q49,28 | Intensity of ISI | 0 | None |
| 1 | Slight | ||
| 2 | Moderate | ||
| 3 | Intense | ||
| 4 | Very intense | ||
| Other classifications | |||
| O129 | Axial appearance | SEA | Snake-eye appearance |
| NSEA | Non snake-eye appearance | ||
| O227 | Position of ISI | Group A | ISI in gray matter only |
| Group B | ISI in gray and white matter | ||
| O338 | T2W signal intensity ratio | Group 1 | <1.32 |
| Group 2 | ≥1.32 and <1.68 | ||
| Group 3 | ≥1.68 | ||