Background: The etiology and pathogenesis of transient global amnesia, a clinical syndrome during which new information cannot be retained while consciousness and other higher cognitive functions are still preserved, is still unknown. Imaging studies, including MRI, diffusion weighted MRI, MR spectrocopy and single-photon emission CT (SPECT) have shown inconsistent results but were rarely combined in a single patient. Case Report: We report on a patient in whom those different imaging modalities were performed during a period of transient global amnesia. All imaging modalities demonstrated normal results. Conclusion:The normal results underline that the etiology and pathogenesis of transient global amnesia still remains unclarified and can at least in this case not be attributed to changes in brain perfusion or a focal ischemia as proposed in previous studies. ZusammenfassungHintergrund: Die Ätiologie und Pathogenese der transienten globalen Amnesie, bei der trotz erhaltenen Bewusstseins und erhaltener kognitiver Funktionen neue Informationen nicht erinnert werden können, ist bislang nicht geklärt. Bildgebende Studien, wie z.B. die MRT, Diffusionsbildgebung, MR-Spektroskopie und Single-Photon-Emissions-CT (SPECT), kamen in verschiedenen Studien zu unterschiedlichen und z.T. widersprüchlichen Ergebnissen. Nur selten wurden die verschiedenen Modalitäten miteinander kombiniert. Kasuistik: Wir berichten über einen Patienten, der während einer transienten globalen Amnesie mit allen oben beschriebenen Methoden untersucht wurde. Von der Norm abweichende Ergebnisse konnten jedoch mit keiner Methode dargestellt werden. Schlussfolgerung: Dieser Normalbefund zeigt, dass die Ätiologie und Pathogenese der transienten globalen Amnesie weiterhin ungeklärt bleibt. Zumindest in diesem Fall lagen offensichtlich keine Veränderung der Hirnperfusion und keine Ischämie vor, die von anderen Autoren als mögliche Ursachen der transienten globalen Amnesie vermutet wurden. IntroductionTransient global amnesia is a clinical syndrome that is characterized by an abrupt onset of transient inability to retain new information but without other neurological signs and with preservation of consciousness, alertness, attention, personal identity and other higher cognitive functions. It is typically accompanied by repetitive questioning and temporal disorientation [2,5,6].The etiology of transient global amnesia is uncertain although various pathogenetic factors have been proposed, including transient ischemia [1,10], epileptic discharges [4,13], migraine [18], or spreading depression of cortical electrical activity [9,14].Single-photon emission computed tomography (SPECT) studies have shown inconsistent findings with some studies demonstrating temporary bilateral hyperperfusion [11,13] and other studies showing a reduced brain perfusion in the temporal regions [3,8,12, 15], suggesting a vascular mechanism that was further confounded by diffusion weighted MRI (DW-MRI) studies [1,16,17]. However, Zorzon et al [18] who investigated metabolic changes in ...
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