Management of a Direct Carotid Cavernous Fistula Caused by Rupture of a Cavernous Aneurysm Previously Embolized with Coils

The development of a high-flow carotid-cavernous fistula from the rupture of a large cavernous aneurysm successfully embolized by coils is rare. A 50-year-old male patient developed a high-flow carotid-cavernous fistula 48 hours after successful coiling of a large left cavernous aneurysm, presumably due to rupture of a focal dissection at or close to the neck of the aneurysm. He initially responded to daily self-compression of the left common carotid artery, but the fistula recurred. After failing to approach the fistula site via transvenous route, balloon trapping of the internal carotid artery was planned. Prior to its placement for functional occlusion test, the detachable balloon slipped into the fistula site and occluded it. It was thereafter detached in this position. The sequence of events, a large cavernous aneurysm spontaneous ruptured after coiling, suggested dissecting process or disease. We address in the report the complexity of the endovascular management of this rare association.