Mycotic aneurysms of the intracavernous segment of the internal carotid artery secondary to cavernous sinus thrombophlebitis are exceedingly rare. The authors report a case with mycotic pseudoaneurysm in the cavernous portion of the internal carotid artery with clinical and angiographic evidence cavernous sinus thrombosis. The strikingly development of the pseudoaneurysms was demonstrated by digital subtraction angiography.