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Abstract

In occlusive vascular brain diseases, the structure of the circle of Willis is of immense importance. A high percentage ofvariations have been reported in the arteries forming circle of Willis. These have profound clinical implications. Withadvances in interventional radiological procedures, the interventional radiologists and neurosurgeons need to have thoroughknowledge of these variations. This article will help readers understand the significance of anatomical variations and theirclinical effects.