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✓ The authors report a case in which the cause of a “spontaneous” carotid-cavernous fistula could not be demonstrated by selective angiography of external and internal carotid arteries. However, postmortem study of the cavernous sinuses revealed an unsuspected ruptured aneurysm of the internal carotid artery at the origin of the meningohypophyseal branch.

Two cases illustrating an unusual connexion between the middle meningeal artery and tentorial branches, normally arising from the siphon, are reported. The significance of this anastomosis is discussed.

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