[Diffusion-weighted MR imaging in a case of dissociative amnesia]

Area of Science:

• Neuroscience
• Psychiatry
• Radiology

Background:

• Differentiating psychogenic from organic amnestic syndromes can be challenging.
• Amnesia can occur following alcohol intoxication and head trauma.

Observation:

• A patient presented with severe retrograde and anterograde amnesia after alcohol intoxication and mild head trauma.
• Brain CT and MRI revealed old posttraumatic lesions in the right temporal lobe.
• Diffusion-weighted MRI (DWI) and perfusion SPECT showed no focal changes in basal temporal lobes.

Findings:

• The patient's amnesia resolved within 4 weeks, with recovery linked to psychological conflicts.
• Absence of focal perfusion changes or DWI signal intensity differentiated the case from transient global amnesia.
• Diffusion-weighted MRI is a powerful tool for diagnosing acute amnestic syndromes.

Implications:

• This case underscores the utility of advanced neuroimaging in diagnosing complex amnestic disorders.
• Understanding the neurobiological underpinnings of psychogenic amnesia is essential for accurate diagnosis and treatment.
• Diffusion-weighted MRI can aid in distinguishing psychogenic amnesia from organic causes, improving patient management.