A case of a large supra-clinoideal aneurysm of the left internal carotid artery involving from the second up to twelveth cranial nerves is reported. The patient, a 55-years-old white female, died 4 days after the angiographic study. The necropsy showed a giant aneurysm originated of the supraclinoideal left internal carotid artery, and an aneurysm of the anterior communicating artery.