The intracranial arteriovenous aneurysms here described are not peculiar to the brain. With the exception of differences of detail due to environment, they are essentially the same as arteriovenous aneurysms situated elsewhere in the vascular system.
The discovery of an arteriovenous aneurysm is always credited to William Hunter.1 Enthusiastic phlebotomists of that period prepared two perfect examples of arteriovenous aneurysm for Hunter, which he was quick to recognize. His description of the signs and symptoms left little to be added, even at the present time. At the point of the communication between the artery and the vein, he recognized a loud hissing murmur and a strong tremulous thrill ; large tortuous venous sacs were seen to pulsate; the brachial artery was greatly enlarged and serpentine cephalad to the arteriovenous fistula, but distal to it, the artery became smaller than on the other side. He was able to reduce the size