Between September, 1948, and January, 1958, we have encountered by angiographic studies 50 patients with nonfilling or thread-like filling of the proximal portion of one anterior cerebral artery (in 1 case bilateral) associated with neurologic and/or psychiatric (dementia, impaired insight, anxiety, loss of initiative, and impaired mentation) signs and symptoms. Stenosis or occlusion of one anterior cerebral artery has been seen in about 11% of the patients who either are admitted with a diagnosis of "stroke" or are proved to have cerebrovascular disease before discharge from the hospital. A portion of this material was reported in a former paper.17
When nonvisualization of one anterior cerebral artery was encountered, a second, and sometimes a third, attempt was made to fill the vessel. In the more recent cases, simultaneous contralateral carotid compression was also used. Head turning was not used at the time of injection, and thus was not a factor