Middle meningeal artery (MMA) embolization is a procedure that's done to stop bleeding from the MMA into the brain. To do this, a thin, flexible tube called a catheter is put into a blood vessel, usually in your wrist. Guided by X-rays, the tip of the catheter is threaded through blood vessels until it reaches the site of the bleeding. Your doctor uses the catheter to place liquid, metal coils, or special particles at the site to form a clot. This stops the bleeding.
The procedure usually takes about 1 to 2 hours. You may spend the night in the hospital for observation.