PCOMMPersonal Communications
PCOMMPosterior Communicating Artery
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Type A: Unilateral ICA agenesis; flow into the ipsilateral anterior cerebral artery (ACA) via the anterior communicating artery (AComm), and flow into the ipsilateral middle cerebral artery (MCA) via flow through the ipsilateral posterior communicating artery (PComm).
Type C: Bilateral ICA agenesis; flow from the posterior circulation via the PComms or other patent carotid-vertebrobasilar anastomoses.
Type E: Bilateral ICA hypoplasia; flow into the MCAs via enlarged PComms.