Bilateral hippocampal abnormalities on diffusion-weighted MRI in transient global amnesia: report of a case

Area of Science:

• Neurology
• Neuroimaging
• Neuroscience

Background:

• Transient global amnesia (TGA) is a neurological condition characterized by sudden, temporary memory loss.
• The underlying pathophysiology of TGA is not fully understood.
• Magnetic resonance imaging (MRI), particularly diffusion-weighted imaging (DWI), has recently identified acute lesions in the hippocampus of TGA patients.

Observation:

• Most reported MRI findings in TGA patients show unilateral hippocampal lesions.
• This case presents a patient with TGA exhibiting high signal-intensity lesions in the bilateral hippocampus on acute-stage DWI.
• Serial brain MRI findings were analyzed to support the diagnosis and proposed mechanism.

Findings:

• The presence of bilateral hippocampal lesions in this TGA case is a notable observation.
• The diffusion-weighted imaging findings suggest an acute ischemic process affecting the hippocampus.
• Serial MRI scans provided evidence supporting the transient ischemic nature of the observed lesions.

Implications:

• This case expands the understanding of potential MRI manifestations in TGA.
• The findings contribute to the ongoing discussion regarding the ischemic etiology of TGA.
• Further research into bilateral hippocampal involvement in TGA may refine diagnostic criteria and treatment strategies.