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The Anatomy of the Posterior Communicating Artery as a Risk Factor for Ischemic Cerebral Infarction NEJM 330:1565-1570, Schomer,D.F.,et al, 1994 See this aricle in Pubmed Article Abstract Only features of the ipsilateral posterior communicating artery were related to the risk of watershed infarction.The presence of posterior communicating arteries measuring at least 1 mm in diameter was associated with the absence of watershed infarction(13 hemispheres no infarcts:P<0. 001).Conversely,there were four watershed infarcts in the 6 hemispheres with posterior communicating arteries measuring less than 1 mm in diameter and 10 infarcts in the 13 hemispheres with no detectable flow in the ipsilateral posterior communicating artery.A small(<1 mm in diameter)or absent ipsilateral posterior communicating artery is a risk factor for ischemic cerebral infarction in patients with internal-carotid artery occlusion.

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