[Intrameatal Aneurysm of Distal Anterior Inferior Cerebellar Artery Manifesting a Subarachnoid Hemorrhage:A Report of 2 Cases].

Two female patients presented with a subarachnoid hemorrhage because of ruptured intrameatal aneurysms of the distal anterior inferior cerebellar artery, which is extremely rare. Each patient underwent microsurgical direct neck clipping or trapping, as needed, by a retrosigmoid craniectomy with an unroofing of the internal auditory meatus. After the surgery, both patients manifested low hearing ability. In recent years, an endovascular therapy or occipital artery-anterior inferior cerebellar artery bypass with aneurysm trapping are being employed to treat intrameatal aneurysms. We present a review of literature, and referred features and treatment techniques for intrameatal aneurysms.