Related Experiment Video
Updated: Mar 8, 2026
Brain Infarct Segmentation and Registration on MRI or CT for Lesion-symptom Mapping
Published on: September 25, 2019
Isolated punctuate hippocampal infarction and transient global amnesia are indistinguishable by means of MRI
A Förster1, M Al-Zghloul1, H Wenz1
1Department of Neuroradiology, Universitätsmedizin Mannheim, University of Heidelberg, Mannheim, Germany.
Abstract:
Background Small punctuate lesions in the hippocampus on diffusion-weighted images are a typical finding in transient global amnesia. Consequently, it has been suggested that diffusion-weighted images findings might corroborate the diagnosis of transient global amnesia. However, isolated punctuate hippocampal infarction might be a differential diagnosis of transient global amnesia. Aim Evaluation of isolated punctuate hippocampal infarction frequency and comparison of its clinical presentation and MRI findings to transient global amnesia. Methods From an MRI database, we identified 10 patients with isolated punctuate hippocampal infarction and compared these to 12 patients with transient global amnesia with diffusion-weighted images lesion with regard to clinical symptoms and MRI findings. Results Disorientation and memory deficits were more common in transient global amnesia patients, whereas dysphasia/aphasia and vertigo were more common in hippocampal infarction patients. MRI findings in isolated punctuate hippocampal infarction and transient global amnesia did not differ significantly, neither regarding the affected hemisphere, lesion distribution, size, nor relative ADC values. Conclusions Differentiation of isolated punctuate hippocampal infarction and transient global amnesia based on neuroimaging findings is not possible. Thus, in the case of isolated punctuate hippocampal diffusion-weighted images lesions the final diagnosis of hippocampal infarction or transient global amnesia should be based on the clinical presentation.
Insights
Transient global amnesia and hippocampal infarction share similar MRI findings. Clinical presentation is key to differentiating these conditions when punctate hippocampal lesions are observed on diffusion-weighted imaging.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Small punctate lesions in the hippocampus on diffusion-weighted images (DWI) are characteristic of transient global amnesia (TGA).
- Diffusion-weighted imaging findings may support TGA diagnosis.
- Isolated punctate hippocampal infarction is a potential differential diagnosis for TGA.
Purpose of the Study:
- Evaluate the frequency of isolated punctate hippocampal infarction.
- Compare clinical presentation and MRI findings of hippocampal infarction to TGA.
Main Methods:
- Retrospective analysis of MRI database.
- Identified 10 patients with isolated punctate hippocampal infarction.
- Compared these patients to 12 TGA patients with DWI lesions.
Main Results:
- Disorientation and memory deficits were more frequent in TGA.
- Dysphasia/aphasia and vertigo were more common in hippocampal infarction.
- No significant differences in MRI findings (hemisphere, lesion distribution, size, ADC values) between the two groups.
Conclusions:
- Neuroimaging alone cannot differentiate isolated punctate hippocampal infarction from TGA.
- Clinical presentation is crucial for diagnosis when punctate hippocampal DWI lesions are present.
Related Concept Videos
01:13Amnesia
The severity and duration of memory loss vary depending on the type and underlying cause. Amnesia is classified into two main types: retrograde and anterograde.
Retrograde amnesia is marked by the loss of memories formed before the onset of the condition. Patients may recall distant past events but often forget those occurring shortly before the incident.
Anterograde...
01:19Role of Hippocampus in Memory