Modified Suzuki scale
| Score | Description of Classification |
|---|---|
| 0 | No evidence of disease |
| I | Mild-to-moderate stenosis around the ICA bifurcation with absent or slightly developed ICA MMD |
| II | Severe stenosis around the ICA bifurcation or occlusion of either proximal anterior or MCA branches with well-developed ICA MMD |
| III | Occlusion of both anterior and MCA branches with well-developed ICA MMD |
| IV | Complete occlusion of both anterior and MCA branches with an absent or small amount of ICA MMD |
Note:—MMD indicates Moyamoya disease.