Cerebral angiography is a medical imaging technique used to visualize the blood vessels in the brain. It involves injecting a contrast dye into the bloodstream, which helps highlight the arteries and veins during X-ray imaging. This procedure is often used to diagnose conditions such as aneurysms, arteriovenous malformations, and stenosis. The process typically requires a catheter to be inserted into a blood vessel, usually in the groin or arm, and guided to the brain's blood vessels. Patients may experience mild discomfort during the injection, but the procedure is generally safe and provides valuable information for treatment planning.