A rare and symptomatic Cavernous Donut-shaped Aneurysm treated by Flow Diverter Deployment.

We describe the case of a 62-year-old woman, who was admitted at our center for acute diplopia secondary to a left III cranial nerve palsy, left eyelid swelling and ptosis, and mild ipsilateral retro-orbital pain. No other motor or sensitive deficits were observed. A CT-Angiography (CTA) and a Digital Subtraction Angiography (DSA) were performed, showing a 25 mm left intra-cavernous aneurysm with a central intrasaccular thrombus, an intra-saccular "swirling" flow with a donut-shape appearance. A flow-diverter stent (FD) was deployed bridging the aneurysmal neck. Twelve months after the procedure the aneurysm was completely occluded and the patient had totally recovered the cavernous syndrome. A careful literature review has been performed and the different endovascular approaches analyzed.