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Table 2: 
Collateral grading system for analysis of the collateral map
ScoreDescription of Collateral Status
5 (Excellent)No or smalla collateral-perfusion delay in the MCA territory in the capillary phase regardless of the collateral status in the arterial phase
4 (Good)Collateral-perfusion delay equal to or less than one-half of MCA territory in the capillary phase and no or small delay in the early venous phase
3 (Intermediate to good)1) Collateral-perfusion delay equal to or less than one-half of the MCA territory in the capillary phase and equal or less than one-half in the early venous phase
2) Collateral-perfusion delay more than one-half of the MCA territory in the capillary phase and no or small delay in the early venous phase
2 (Intermediate to poor)Collateral-perfusion delay more than one-half of the MCA territory in the capillary phase and equal to or less than one-half in the early venous phase
1 (Poor)Collateral-perfusion delay more than one-half of the MCA territory in the early venous phase and equal to or less than one-half in the late venous phase
0 (Very poor)Collateral-perfusion delay/defect more than one-half of the MCA territory in the late venous phase regardless of perfusion status at previous phases
  • ↵a “Small” indicates an area <1 of 8 MCA regions (Fig 5).