Rare Sighting of Posterior Communicating Artery Infundibulum With Posterior Cerebral Artery Origin

Infundibula are funnel-shaped lesions that develop at the intersections of major intracranial arteries. These lesions are prone to being misdiagnosed as intracranial aneurysms. The most common arterial infundibula have been noted in the posterior communicating artery (PCoA) branch of the internal carotid artery (ICA). Digitally subtracted angiography performed included catheter angiography of the vertebral artery and ipsilateral carotid to evaluate the suspected lesion. Right vertebral angiography demonstrated an infundibulum seen at the right PCoA/posterior cerebral artery (PCA) junction, with noted posterior-to-anterior circulation dominance of the Circle of Willis collateral flow. We report a case of posterior communicating artery infundibulum arising from the posterior cerebral artery origin in a 38-year-old man.