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Carotid-cavernous fistula
A carotid-cavernous fistula (CCF) results from an abnormal communication between the arterial and venous systems within the cavernous sinus in the skull. It is a type of arteriovenous fistula. As arterial blood under high pressure enters the cavernous sinus, the normal venous return to the cavernous sinus is impeded and this causes engorgement of the draining veins, manifesting most dramatically as a sudden engorgement and redness of the eye of the same side.
==Causes==
Carotid cavernous fistulae may form following closed or penetrating head trauma, surgical damage,
rupture of an intracavernous aneurysm, or in association with connective tissue disorders, vascular diseases and dural fistulas.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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