Figure 4. Digital subtraction angiography with early and late phase demonstrating (A) left subclavian artery occlusion with (B) retrograde vertebral filling of proximal subclavian artery.

A brain aneurysm (also called a cerebral aneurysm or an intracranial aneurysm) is a ballooning arising from a weakened area in the wall of a blood vessel in the brain. If the brain aneurysm expands ...