Abnormal posterior circulating artery morphology Aplasia of posterior communicating artery 2023-02-20T13:33:39Z The posterior communicating arteries connect the internal carotid artery just proximal to its bifurcation into the anterior cerebral artery and middle cerebral artery with the posterior cerebral artery. The posterior communicating artery is part of the circle of Willis. A developmental anomnaly characterized by the lack of development of the posterior communicating artery. Absence of both posterior communicating arteries