[Extracranial internal carotid occlusion and coexisting ipsilateral intracranial internal carotid aneurysm].

A rare case of extracranial internal carotid occlusion with a coexisting ipsilateral internal carotid aneurysm is reported. A 50-year-old male had a sudden onset of severe headache, vomiting and right motor weakness on May 14, 1984. Two days later the patient was transferred to our hospital. On admission he was alert but presented with nuchal rigidity and right moderate hemiparesis. He had an episode of a blunt head injury 12 years previously, but no history of hypertension, diabetes mellitus or cerebral stroke. A computed tomography revealed mild subarachnoid hemorrhage and mild ventricular dilatation. A cerebral angiography did not demonstrate any aneurysms but it revealed occlusion of the right internal carotid artery at the cervical bifurcation. The repeated angiography on May 31 disclosed a saccular aneurysm arising anteromedially at the level of the junction of the right posterior communicating artery and the internal carotid artery. The cervical internal carotid artery remained occluded at the same site. The middle cerebral artery was supplied through the well-developed posterior communicating artery, and the right anterior cerebral artery was supplied through the anterior communicating artery. Clipping of the aneurysm was attempted but it was forcibly trapped because of premature bleeding on June 5. The right V-P shunt was performed for the progressive ventricular dilatation on June 12. The patient was discharged with no paresis on June 20. It has been well known that the uni- or bilateral carotid occlusion, whatever the origins are, are often associated with cerebral aneurysms.(ABSTRACT TRUNCATED AT 250 WORDS)