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Figure 1: MRI brain of a 37-year old man who presented with left hemispheric transient ischemic attack (TIA). (a) Axial diffusion weighted image showing small acute infarcts in the left anterior cerebral artery (ACA) territory; (b) Axial FLAIR image showing grade-I FAZEKA small vessel ischemic changes (arrow head) and infarct in left centrum semiovale (arrow); (c) DSA showing vessel wall irregularities and stenosis involving pericallosal and cortical branches of left ACA and middle cerebral artery (MCA); (d) T1 axial pre-contrast image; (e) T1 post contrast 3D axial image showing diffuse wall thickening and enhancement involving M1 segment of right MCA (arrow) and basilar artery (arrow head), (f) T1 post contrast 3D sagittal image showing diffuse smooth vessel wall thickening and enhancement involving M1 segment of right MCA (arrow) and right petrous internal carotid artery [ICA] (arrow head). FLAIR- Fluid attenuation inversion recovery

Figure 1: MRI brain of a 37-year old man who presented with left hemispheric transient ischemic attack (TIA). (a) Axial diffusion weighted image showing small acute infarcts in the left anterior cerebral artery (ACA) territory; (b) Axial FLAIR image showing grade-I FAZEKA small vessel ischemic changes (arrow head) and infarct in left centrum semiovale (arrow); (c) DSA showing vessel wall irregularities and stenosis involving pericallosal and cortical branches of left ACA and middle cerebral artery (MCA); (d) T1 axial pre-contrast image; (e) T1 post contrast 3D axial image showing diffuse wall thickening and enhancement involving M1 segment of right MCA (arrow) and basilar artery (arrow head), (f) T1 post contrast 3D sagittal image showing diffuse smooth vessel wall thickening and enhancement involving M1 segment of right MCA (arrow) and right petrous internal carotid artery [ICA] (arrow head). FLAIR- Fluid attenuation inversion recovery