[Extracranial aneurysm of the internal carotid artery. A case report].

The authors report a case of extracranial aneurysm of the internal carotid artery. This case of a 53-year-old man demonstrates how difficult an early and exact diagnosis can be, even in these days with their considerable variety of modern diagnostic techniques--depending on the order of their use. In comparable cases, we therefore postulate the early use of angiography, neuromonitoring during the operation and the ultrasound-examination of the complete arterial system in search for further aneurysms.