Answer:
High pressure and local hemorrhage of the venous system.
Explanation:
Cerebral angiography may be defined as medical diagnostic technique that uses the Xray for the production of image. Any blockage can be diagnosed by this technique.
The arteriovenous malformation can cause severe headaches. This condition might occur due to the high blood pressure and difficulty in blood flow in the brain and body. Any hemorrhage in the body especially in the venous system might result in arteriovenous malformation.
