Evaluation of Collateral Flow from Posterior Cerebral Artery after Middle Cerebral Artery Occlusion with MR Angiography

Objective:To evaluate the 3D MRA manifestation of collateral vessels after middle cerebral artery occlusion.Methods:The MR angiographic findings were retrospectively analyzed in 75 patients with middle cerebral artery territory infarct,and collateral flow was evaluated.Results:M1-segment middle cerebral artery occlusion was found in all the 75 patients at 3D-TOF MR angiography,and thicking,prolongation and increasing branches of poterioinferioer branch and P4 segment of ipsilateral posterior cerebral artery were found,but the ipsilateral anterior cerebral artery had no significant change.Conclusion:Obvious changes of ipsilateral poterior cerebral artery can be found on MRA after M1-segment middle cerebral artery occlusion,suggesting the compensating blood flow of infarct area mainly comes from the posterior cerebral artery via the leptomeningeal anastomosis.