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Updated: Mar 12, 2026
Investigations on Alterations of Hippocampal Circuit Function Following Mild Traumatic Brain Injury
Published on: November 19, 2012
Major neurocognitive disorder followıng isolated hippocampal ischemıc lesions
1Stroke Unit, Neurology Department, Ege University, School of Medicine, İzmir 35100, Turkey.
Background And Purpose:
Major cognitive disorder (MND) following vascular events is known as second causes of dementia after Alzheimer's disease (AD). Acute onset MND due to isolated hippocampal infarction has not been recognized as a specific subtype of vascular dementia, and there is no validated criteria for the identification of such cases, either clinically or radiologically.
Results:
Among 7200 patients with first-ever ischemic stroke, 22 patients (0.3%) showed acute isolated ischemic lesions in the hippocampus. Four of them presented acute MND characterized by confusion at the beginning of stroke and thereafter they developed typical clinical characteristics of MND. These cases allowed us to delineate a specific type of dementia characterized by confusion at stroke onset, dull and aimless appearance, verbal and visual immediate or delayed memory deficits, dysexecutive syndrome. Major cognitive disorder was developed due to anterior involvement of the hippocampus with little interindividual variation. Stroke mechanism was artery-to-artery embolism or cardioembolism which can explain isolated infarcts of the hippocampus.
Conclusions:
Hippocampal MND generally occurred in acute bilateral isolated hippocampal infarcts. The clinical characteristic of MND may be secondary to lesions of the body of the hippocampus and interruption of the hippocampo-temporal pathways and cortical projections.
Insights
Acute major cognitive disorder (MND) following stroke can result from isolated hippocampal infarction. This specific vascular dementia subtype presents with confusion and memory deficits, often linked to bilateral hippocampal lesions.
Area of Science:
- Neurology
- Neuroscience
- Vascular Dementia Research
Background:
- Major cognitive disorder (MND) is a significant consequence of vascular events, second only to Alzheimer's disease (AD).
- Acute MND resulting from isolated hippocampal infarction is not yet a recognized subtype of vascular dementia.
- There is a lack of validated clinical and radiological criteria for identifying such cases.
Purpose of the Study:
- To identify and characterize acute major cognitive disorder (MND) resulting from isolated hippocampal infarction.
- To establish clinical and radiological criteria for this specific subtype of vascular dementia.
- To understand the stroke mechanisms leading to isolated hippocampal infarcts.
Main Methods:
- Retrospective analysis of 7200 patients with first-ever ischemic stroke.
- Identification of patients with acute isolated ischemic lesions in the hippocampus.
- Clinical and radiological assessment of patients presenting with acute MND and hippocampal lesions.
Main Results:
- 22 patients (0.3%) exhibited acute isolated hippocampal ischemic lesions.
- Four patients developed acute MND characterized by initial confusion, followed by memory deficits and dysexecutive syndrome.
- The observed MND was associated with anterior hippocampal involvement and specific stroke mechanisms (artery-to-artery embolism or cardioembolism).
Conclusions:
- Major cognitive disorder (MND) is often associated with acute bilateral isolated hippocampal infarcts.
- The clinical presentation of hippocampal MND is likely due to lesions in the hippocampus body and disruption of hippocampo-temporal pathways.
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