Due to poor air quality related to fires in California, the Academy’s San Francisco offices will be closed Friday, Nov. 16. Member support staff will not be available by phone and responses to emails may be delayed.

  • 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).