Table 1:

Modified Suzuki Score^*

Score	Description of classification
0	No evidence of disease
I	Mild-to-moderate stenosis around 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 (only a few of anterior or MCA branches or both are faintly opacified in antegrade fashion through meshwork of ICA MMD)
IV	Complete occlusion of both anterior and MCA branches with absent or small amount of ICA MMD (without opacification of either anterior or MCA branches in antegrade fashion)

MMD = moyamoya disease.

^*Reprinted with permission from Strother MK, Anderson MD, Singer RJ, Du L, Moore RD, Shyr Y, et al: Cerebrovascular collaterals correlate with disease severity in adult North American patients with Moyamoya disease. AJNR Am J Neuroradiol 35:1318–1324, 2014.