Crossing the boundaries of classically delineated medical and surgical specialties including neurosurgery, neuroradiology, and neurology, Interventional Neuroradiology uses advanced neuroimaging combined with endovascular techniques to guide catheters and devices through blood vessels to treat disease involving structures of the head, neck, and central nervous system. Through the combination of the latest imaging modalities and microdevice delivery, interventional neuroradiologic techniques are currently revolutionizing therapy of many of the most common neurological and neurosurgical disorders. These advances now provide noninvasive treatment for many disorders that were previously treated only with open surgical techniques, and make treatments possible for many patients - who until recently would have had no acceptable therapeutic options.