A: Axial T1 MRI without contrast demonstrates a large mass near the inferior left basal ganglia containing areas of bright signal (thrombus or slow-moving.

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A: Axial T1 MRI without contrast demonstrates a large mass near the inferior left basal ganglia containing areas of bright signal (thrombus or slow-moving blood). The horizontal pulsation artifact indicates that this is an aneurysm as a tumor would not cause a MRI pulsation artifact. B: Axial T2 image shows mixed bright and dark T2 signal within this large aneurysm representing areas of flowing blood (dark signal) and slow-moving blood or thrombus (brighter signal). C: Frontal angiogram demonstrates a giant aneurysm arising from the ICA terminus/MCA. Source: Chapter 2. Atraumatic Conditions of the Head and Face, The Atlas of Emergency Radiology Citation: Block J, Jordanov MI, Stack LB, Thurman R. The Atlas of Emergency Radiology; 2013 Available at: http://accessemergencymedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/bloc1/bloc1_c002f010a.png&sec=42496707&BookID=573&ChapterSecID=42496364&imagename= Accessed: December 17, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved