Fig 1.
Collateral patterns assessment and classification system.
A symmetric pattern was defined as contrast visualized with similar conspicuity of the ischemic compared to the contralateral non-ischemic MCA territory. A malignant pattern was defined as no contrast visualized over at least 50% of the MCA territory at risk. “Other” was defined as any additional pattern, rated as intermediate between symmetric and malignant.
Table 1.
Patient demographics, risk factors, presentations, treatments, and outcomes.
Fig 2.
Ninety-day modified Rankin Scale (mRS) score comparing collateral patterns.
Table 2.
Determinants of 90-day modified Rankin Scale (mRS) score ≤2.