A and B: Precontrast images from a black-blood magnetic resonance angiogram show increased signal along the margin of the aneurysm centered at the A1/A2.

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A and B: Precontrast images from a black-blood magnetic resonance angiogram show increased signal along the margin of the aneurysm centered at the A1/A2 junction (curved arrow), with a normal flow void in the proximal aneurysm (straight arrow). A and B: Precontrast images from a black-blood magnetic resonance angiogram show increased signal along the margin of the aneurysm centered at the A1/A2 junction (curved arrow), with a normal flow void in the proximal aneurysm (straight arrow). C and D: Postcontrast images exhibit focal enhancement of the wall of the A1/A2 junction aneurysm (curved arrow), while the proximal lesion shows none (straight arrow). Andrew J. Steven et al. TOJ 2016;16:199-202 Copyright © 2018 by Ochsner Clinic Foundation