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TABLE 1: Grades of increasing severity of arterial occlusion
Grade Type of Occlusion 
0 No occlusion 
1 MCA occlusion (M3 segment) ACA occlusion (A2 or distal segments) 1 BA and/or VA branch occlusion
2 MCA occlusion (M2 segment) ACA occlusion (A1 and A2 segments) ≥2 BA and/or VA branch occlusions
3 MCA occlusion (M1 segment) 
 3A Lenticulostriate arteries spared and/or leptomeningeal collaterals visualized 
 3B No sparing of lenticulostriate arteries and no leptomeningeal collaterals visualized 
4 ICA occlusion (collaterals present) BA occlusion (partial filling, direct or via collaterals) 
 4A Collaterals fill MCA Anterograde filling^* 
 4B Collaterals fill ACA Retrograde filling^* 
5 ICA occlusion (no collaterals) BA occlusion (complete) 
Note.—Grading system is from Qureshi AI: New grading scheme for angiographic evaluation of arterial occlusions and recanalization response to intra-arterial thrombolysis in acute ischemic stroke.
Neurosurgery 2002;50:1405–1415 (7). MCA indicates middle cerebral artery; ACA, anterior cerebral artery; BA, basilar artery; VA, vertebral artery; ICA, internal carotid artery.
* Predominant pattern of filling.