MR imaging of pontine and extrapontine myelinolysis

Area of Science:

• Neurology
• Neuroimaging
• Pathology

Background:

• Electrolyte derangements can lead to serious neurological complications.
• Osmotic demyelination syndrome encompasses pontine and extrapontine myelinolysis.
• Understanding the imaging and clinical spectrum is crucial for diagnosis and management.

Observation:

• Two cases of pontine and extrapontine myelinolysis following electrolyte imbalances are detailed.
• Magnetic resonance (MR) imaging revealed only extrapontine lesions in one patient.
• Autopsy confirmed both pontine and extrapontine myelinolysis in the first case.

Findings:

• The second patient experienced a full clinical recovery.
• Extrapontine lesions resolved on MR imaging in the recovering patient.
• This highlights the potential for recovery and the diagnostic utility of MR imaging.

Implications:

• Accurate diagnosis of myelinolysis relies on a combination of clinical presentation, neuroimaging, and, if necessary, postmortem examination.
• Early recognition and management of electrolyte imbalances are critical to prevent or mitigate neurological damage.
• The variability in lesion presentation and recovery underscores the complexity of osmotic demyelination syndrome.