a syndrome arising as a consequence of rupture or aneurysm in the anterior communicating artery. This artery is small, located within the brain, and links right and left cerebral arteries. This syndrome causes attentional deficits and severe confusional states - as well as a severe lack of insight. Following the confusion, anterograde or retrograde amnesia may be apparent. See also frontal-lobe syndrome, corticospinal tract.