564 AN UNUSUAL PRESENTATION OF ICA DISSECTION. A CASE OF TRANSIENT GLOBAL AMNESIA IN A PATIENT WITH PAINLESS SPONTANEOUS INTERNAL CAROTID ARTERY DISSECTION


 
 
 A 42-year-old woman was carried to emergency room lamenting sudden memory loss. Her husband witnessed the onset of the episode. No recent head trauma was reported, blood pressure was under control.
 Anterograde and retrograde memory loss was present and confirmed by a neurologist. No other neurological signs were elicitable. Blood exams and toxicological analysis were negative. ECG, chest radiography, and cerebral TC showed no abnormalities. At physical examination a carotid bruit could be appreciated.
 We performed an eco-color-Doppler of carotid artery that showed a left common and internal carotid artery dissection (figure 1). The diagnosis of ICA dissection was confirmed with a contrast CT. The coexistence of an aortic dissection was excluded with the same imaging technique.
 The anterograde amnesia resolved 15 h after the admission. A neurologist confirmed that the patient experimented an episode of transient global amnesia (TGA).
 After a vascular surgery consultation, a conservative treatment was deemed appropriate. After a 6 month follow up the patient didn't complain of any other neurological symptom or sign.
 Transient global amnesia (TGA) is characterized by reversible anterograde and retrograde amnesia of sudden onset. This amnesic syndrome resolves spontaneously within 24 h. Annual incidence rate for all ages of spontaneous ICA dissection is approximately of 2.6 per 100 000 inhabitants, however data are extremely variable among different studies. TGA has never been associated with a spontaneous ICA dissection. In order to not miss a spontaneous ICA dissection as a rare ethology of TGA, we suggest performing an eco-color-Doppler of the epi-aortic vessels in patient affected by such amnesic syndrome.
