Dementia and Neurocognitive Disorders  2017;16(3):87-90

doi:10.12779/dnd.2017.16.3.87

Hippocampal Lesions of Diffusion Weighted Magnetic Resonance Image in Patients with Headache without Symptoms of Transient Global Amnesia.

Jeong Hoon PARK 1 ; Chung Geun OH ; Sung Hun KIM ; Seung Hwan LEE ; Jae Won JANG

Affiliations

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Keywords

transient global amnesia; hippocampus; diffusion-weighted magnetic resonance image

Country

Republic of Korea

Language

English

Abstract

BACKGROUND: The dot-like hippocampal signal intensity in diffusion-weighted MR images is well-known as a characteristic imaging feature in transient global amnesia, a neurological syndrome in which sudden forward-and-backward memory loss occurs that is slowly recovered within 24 hours. We here report on patients with this dot-like hippocampal hyperintensity who did not present with anterograde amnesia except for headaches. CASE REPORT: Two women without a specific medical history presented with sudden-onset headaches on the same day. Neither had any trauma or infection history before the symptom or any sudden emotional or postural changes. Brain MRI showed tiny hippocampal high signal intensity on diffusion-weighted images (DWI). CONCLUSIONS: Dot-like hippocampal lesions seen on DWI may be present without memory impairment, and more studies are needed to determine whether there is any association with headache as in this case.