• Courtesy of Leo Hochhauser, MD.
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    A, Sagittal view of the brain on a T2-weighted MRI scan shows a low-intensity signal in the subarachnoid space anterior to the medulla (arrow), contiguous with the vertebral artery inferiorly, consistent with flowing blood. B, Conventional arteriography shows a vertebral artery aneurysm (arrow). C, The same aneurysm, as demonstrated by MRA (arrow).