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Duplicated anterior choroidal artery (AChA) in an embryonic circle of Willis. The AChA is the main source of arterial blood to the uncal region. A duplicated AChA is shown in a specimen presenting an embryonic circle of Willis. Recognition of such variations is key to perform safer surgeries in this region. 1: Middle cerebral artery; 2: Posterior cerebral artery; 3: Duplicated AChA.
