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Table 1: Scale for grading intracranial vasospasm
Grade Definition
0 No spasm
1 Mild spasm (<25% luminal narrowing)
2 Moderate spasm (25–50% luminal narrowing)
3 Severe spasm (51–99% luminal narrowing)
4 Total occlusion
Grade	Definition
0	No spasm
1	Mild spasm (<25% luminal narrowing)
2	Moderate spasm (25–50% luminal narrowing)
3	Severe spasm (51–99% luminal narrowing)
4	Total occlusion