[Dissection of the internal carotid artery. Personal case reports and a review of the literature].

The clinical and angiographic features of 20 patients affected by internal carotid artery dissection are reported. In one patient the neurological signs were related to a traumatic event, in two cases the symptoms presented after hyperextension of the neck during athletic events, while their onset was apparently spontaneous in the remaining 17 patients. Plain CT was normal in 14 cases and positive for ischemic necrosis in 6 patients. Angiography demonstrated extensive/segmental stenosis of the internal carotid lumen in 12 cases (60%), pseudoaneurysmal dilatation in 3 cases (15%), and complete carotid occlusion in 5 patients (25%). The "double lumen" feature was seen in 3 cases at the origin of the dissection. One patient died, surgical ligature of the internal carotid artery was performed in two cases, while the other patients received medical treatment with platelet inhibitors, except for the young patient affected by post-traumatic artery dissection. Complete recovery was observed in 82% of the patients. Follow-up angiograms demonstrated normal recanalization of the internal carotid artery in 4 out of 6 patients; one of them had two false aneurysms which following angiograms demonstrated to be completely resolved. Regression of stenosis was observed in 6 of the remaining patients by Doppler US. On the whole, the recanalization of the internal carotid artery was observed in 59% of cases. Angiographic findings seemed not to play a decisive role in the prognosis of carotid dissections, which largely depends on the overall patient's condition and on the presence/absence of ischemic cerebral damages.