Figure 2: Double recurrent artery of Heubner (RAH). (a) Double RAH with different points of origin (arrow heads); single RAH (arrow). (b) Bilateral doubled RAH originating as one stem and later bifurcated (arrow). A1—precommunicating part of anterior cerebral artery (ACA); A2—postcommunicating part of ACA; ACoA—anterior communicating artery; IC—internal carotid artery; PCoA—posterior communicating artery; PCA—posterior cerebral artery; BA—basilar artery.