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We present a case of a posterior communicating (Pcom) artery infundibulum that progressed to an aneurysm in a patient with Polycystic liver disease without kidney cyst after embolization of the controlateral Pcom aneurysm. The infundibulum had been documented on angiography 4 years earlier, while a ruptured controlateral Pcom aneurysm was embolised. The patient presented to the outpatient clinic with right postorbital headache and cranial Ⅲ nerve palsy. Head CT scan found no gross subarachnoid hemorrhage. Though MR angiography note a 7-mm pcom aneurysm at the previous site of Pcom infundibulum. The patient underwent coiling for the novel aneurysm with a good result. This case illustrates a small but growing number of cases which developed from infundibula into aneurysms. It suggests that polycystic disease may pose an additional risk for infundibulum while what has traditionally been considered as a benign lesion.

international journal of neurology and neurotherapy

Novel Aneurysm Grown from a PcomA Infundibulum after Embolization of a Contralateral Posterior Communicating Aneurysm in an Isolated Polycystic Hepatic Patient: A Case Report