Pial vasodilation. Pial vasodilation. A, Axial GRE T2 image shows a left frontal sulcal SAH (black arrowhead), possibly located in the “watershed” territory.

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Presentation transcript:

Pial vasodilation. Pial vasodilation. A, Axial GRE T2 image shows a left frontal sulcal SAH (black arrowhead), possibly located in the “watershed” territory between the anterior and the middle cerebral arteries. B, Axial maximum-intensity-projection reconstruction of CTA shows an asymmetry of the distal arteries, in favor of left pial vasodilation. C, Frontal projection of 3D angiography of the left carotid artery reveals a severe stenosis at the origin of the M2 branch (white arrowhead). V. Cuvinciuc et al. AJNR Am J Neuroradiol 2010;31:1355-1362 ©2010 by American Society of Neuroradiology