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Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
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A Case With Bilateral Hippocampal Infarction Resembling Transient Global Amnesia
Tetsuya Akaishi1, Mami Asari2, Sumireko Sekiguchi2
1Department of Education and Support for Regional Medicine, Tohoku University, Sendai, Japan.
Journal of Medical Cases
|August 2, 2024
Summary
Distinguishing transient global amnesia (TGA) from hippocampal infarction is challenging due to similar early MRI findings. Follow-up MRI after 7 days is crucial for accurate diagnosis of infarction.
Area of Science:
- Neurology
- Radiology
Background:
- Transient global amnesia (TGA) presents as sudden, temporary memory loss.
- Hippocampal infarction can mimic TGA but requires specific treatment.
Observation:
- A 60-year-old female presented with acute retrograde and anterograde amnesia.
- Initial thin-slice MRI showed bilateral hippocampal restricted diffusion on DWI.
- Follow-up MRI at 7 days revealed persistent restricted diffusion, confirming infarction.
Findings:
- Distinguishing TGA from hippocampal infarction based on early MRI (within days) can be difficult.
- Bilateral hippocampal infarction was diagnosed due to persistent diffusion restriction on follow-up imaging.
- Thin-slice MRI and delayed imaging are key diagnostic tools.
Implications:
- This case highlights the diagnostic challenges in differentiating TGA from hippocampal infarction.
- Early cardiovascular risk assessment and serial MRI are vital for correct diagnosis.
- Accurate diagnosis ensures appropriate relapse-prevention treatment for hippocampal infarction.
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