The Collateral Score (CS) grades the collateral blood supply to the territory of an occluded middle cerebral artery (MCA).
|
Collateral Blood Supply
|
Grade
|
|
none (0%)
|
0
|
|
1-50%
|
1
|
|
51-99%
|
2
|
|
100%
|
3
|
The better the collateral circulation the better the outcome.
