a vascular shunt between the meningeal branches of the internal or external carotid arteries , under artery and the cavernous sinus.
du·ral ca·ver·nous si·nus fis·tu·la
(dūr'ăl kav'ĕr-nŭs sī'nŭs fis'tyū'lă) A vascular shunt between the meningeal branches of the internal or external carotid arteries and the cavernous sinus