Fig. 2
From: Imaging predictors of procedural and clinical outcome in endovascular acute stroke therapy
Dense middle cerebral artery (MCA) sign with an ischemic penumbra in a 68-year-old male with acute stroke. Non-contrast computed tomography (CT) demonstrates a dense left MCA with long length of thrombus (a). This manifests “blooming” on gradient recalled echo (GRE, b) magnetic resonance imaging. CT angiography (CTA) shows a left carotid terminus occlusion extending into the left middle cerebral artery (c), with a better depiction of collaterals than can be seen on the time-of-flight magnetic resonance angiogram (MRA, d). Diffusion weighted MR image (DWI, e) and perfusion weighted MRI Tmax map with colorized overlay representing the infarcted core (pink, e) and the territory at risk (green, f), here showing a favorable perfusion pattern with a small ischemic core and large penumbra