Progress in treating ruptured infundibular dilatation at the origin of the intracranial posterior communicating artery.

Infundibular dilatation (ID) can occur at the origin of the intracranial posterior communicating artery. When this type of widening is less than 3 mm in diameter and the ID reaches the posterior communicating artery, it can be called posterior communicating artery infundibular dilatation (Pcom-ID). Currently, Pcom-ID is considered a normal anatomic variation, and the majority of Pcom-IDs are stable. However, in some cases, rupture occurs in a Pcom-ID; furthermore, Pcom-IDs can evolve into aneurysms. There are not many studies on Pcom-ID rupture hemorrhage; therefore, we performed a retrospective evaluation of published studies on Pcom-ID rupture hemorrhage and conducted a classification analysis for this condition. It is reasonable to classify Pcom-ID into three types: Type 1, direct rupture of the Pcom-ID; Type 2, bleb rupture of Pcom-ID; and Type 3, Pcom-ID rupture caused by an aneurysm. This type of classification can provide meaningful guidance for treating ruptured Pcom-ID. In addition, the present study also included a systematic review and summarization of the literature on each type. This investigation was aimed to improve the understanding of Pcom-ID rupture hemorrhage.