Patterns of collateralization in acute ischemic stroke in the posterior circulation

Assessment of collateral flow in posterior circulation stroke (PCS) by MRI techniques has not been studied systematically. We aimed to investigate collateral flow in 38 PCS patients with two different approaches: presence of FLAIR vascular hyperintensities (FVH) and dynamic 4D angiograms generated from perfusion-weighted raw images. Collateral flow as represented by FVH was present in 30 (78.9%) patients with PCS. Collateralization grade on dynamic 4D angiograms was 0 in 1 (3.3%), 1 in 9 (23.7%), 3 in 18 (47.4%), and 4 in 10 (26.3%) patients. Collateralization in PCS can be assessed in detail by different static and dynamic MRI techniques.

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