i) Aneurysm

Q: If the initial angiogram for SAH is negative, what is the imaging algorithm?

A: Repeat the angio in 4-7 days.

The aneurysm may not be visualized because of thrombus in the dome, which may lyse, leaving the pt with the risk of rebleed.

Ddx:

Pcom aneurysm vs. infundibulum

ACR Case in Point

9/22/2014

A-comm aneurysm

An interesting story by Anton Hasso of his experience with SAH (added 8/18/22)