Abstract
Spontaneous carotid cavernous fistula is usually caused by lesions in the internal carotid cavernous sinus and its branches. We report a young male patient with no history of trauma, in whom the fistula was located at the cavernous sinus of the internal carotid artery. The postoperative angiography found a pseudoaneurysm at the origin of the cavernous sinus of internal carotid artery, which suggested that cavernous sinus fistulas were caused by bleeding from rupture of thin-walled vessels due to the local abnormalities of the vascular wall.
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