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A case is reported in which an aneurysm arising at the junction of the right internal carotid artery and a persistent primitive trigeminal artery ruptured to form a carotid-cavernous fistula. The internal carotid artery was ligated without any signs of brain-stem ischemia due to inverted blood flow through the primitive trigeminal artery.
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Enomoto et al. (1977) studied this question.
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