Hypoplastic posterior communicating artery 2013-12-09T07:06:12Z A developmental anomnaly characterized by underdevelopment of the posterior communicating artery. HP:0012519 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. Hypoplastic posterior communicating arteries UMLS:C4020720 Abnormal posterior circulating artery morphology