Infundibular dilation and aneurysm at the origin of the posterior communicating artery: differential diagnosis by CT angiography

Introduction Infundibular dilation (ID) and aneurysm at the internal carotid artery (ICA)–posterior communicating artery (PComA) junction can be difficult to distinguish but may differ in clinical significance. The aim of this study was to evaluate the utility of CT angiography (CTA) in differentially diagnosing IDs and small unruptured aneurysms at the ICA–PComA junction.