Transient global amnesia--a review of 213 cases from the literature.

TGA is a clearly recognisable clinical syndrome with many and varied aetiologies, the most ubiquitous being transient cerebral ischaemia. This entity is probably much more common than the literature suggests, many patients not coming to the attention of a physician due to the transient nature of the isolated memory defect and the risk of recurrence being low, it is of interest that many of the original patients described tended to be the more prominent members of the community, e.g. physicians and relatives of physicians, perhaps suggesting that the occurrence of TGA in such a person is less likely to pass unnoticed. In the differential diagnosis one should include the following: transient cerebral ischaemia, epilepsy, migraine, temporal lobe encephalitis, psychogenic fugues, post-traumatic, and rarely cerebral neoplasms.