Complex Variation in the Brain Arteries in Tehran

Variations in the cerebral arterial circle (CAC) correlate with incidence of some cerebrovascular diseases and must be considered during surgical operations (1, 2). It also seems that different distribution of variations of the CAC is related to the race. This issue may partially explain the different incidences of some of the cerebrovascular diseases in different ethnic or racial groups (3-5). Although there have been some reports of Variations in the cerebral arterial circle in other part of the world, the evidence for Iranian population is poorly reviewed. A 70 year-old female of Tehran population in central Iran is presented here. In this case Subclaivan and Vertebral arteries have abnormal origin and circumflex of Willis isn't complete because posterior cerebral arteries are absent.