Dement Neurocogn Disord.  2017 Sep;16(3):87-90. 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

Affiliations
  • 1Department of Neurology, Kangwon National University Hospital, Chuncheon, Korea. light26@kangwon.ac.kr

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.

Keyword

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

MeSH Terms

Amnesia, Anterograde
Amnesia, Transient Global*
Brain
Diffusion*
Female
Headache*
Hippocampus
Humans
Magnetic Resonance Imaging
Memory
Memory Disorders
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