Will a head cat scan show a brain aneurysm?

Specialized CTA may: A ct angiogram will more likely be a good screening test. The gold standard is a 4 vessel cerebral angiogram.

Thanks for asking!: It has to be very big and partially calcified... Mri and mra are more sensitive for this purposes...

Sometimes: If an aneurysm is large, and especially if there are calcifications in the wall of the vessel, it can be seen on ct. However, angiography with a ct (dye in vessels, looking at the vessels themselves) is better test. Mrangiography is also sometimes useful, certainly better than simple ct done without contrast.