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. 2021 Jan;42(2):221–227. doi: 10.3174/ajnr.A6889

FIG 5.

FIG 5.

Coronal arterial phase mCTA MIP image demonstrates right M1 segment occlusion (A). Axial arterial phase mCTA MIP image (B) shows filling of at most 50% of distal branches. Axial delayed phase mCTA MIP image (C) shows filling of most distal branches. The patient underwent mechanical thrombectomy with restoration of TICI 2c flow. Follow-up diffusion-weighted MR image shows a small infarct core. If only sCTA had been used in this case (analogous to the arterial phase of the mCTA, B), the collateral status would have been classified as “poor to moderate distal collaterals” instead of “good collaterals.”