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Unusual amnesia in a patient with VGKC-Ab limbic encephalitis: a case study

Luke D Kartsounis1, Rajith de Silva

  • 1Essex Neurosciences Centre, Queen's Hospital, Romford, Essex, UK. ld@kartsounis.fsnet.co.uk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|April 3, 2010
PubMed

Insights

This case study details voltage-gated potassium channel antibody-associated encephalitis (VGKC-Ab) in a patient with memory impairment. Immunotherapy improved cognitive function, but confabulation persisted, broadening the understanding of VGKC-Ab encephalitis.

Area of Science:

  • Neurology
  • Immunology

Background:

  • Voltage-gated potassium channel antibody-associated encephalitis (VGKC-Ab) is a rare autoimmune disorder affecting the nervous system.
  • Limbic encephalitis, a subtype of VGKC-Ab, typically presents with memory deficits and cognitive impairment.

Observation:

  • A patient with confirmed VGKC-Ab encephalitis presented with bilateral hippocampal hyper-intensity on MRI, preserved hippocampal volumes, and significant anterograde and retrograde memory impairment.
  • The patient exhibited fluctuating recall abilities and a notable tendency to confabulate during unstructured interviews, even after cognitive recovery.

Findings:

  • Immunotherapy led to substantial clinical improvement, with the patient performing within or above average on formal memory and executive function tests.
  • Despite cognitive recovery, the persistent confabulation suggests a complex and unusual memory disorder associated with VGKC-Ab encephalitis.

Implications:

  • This case expands the known clinical spectrum of VGKC-Ab limbic encephalitis.
  • The findings prompt further investigation into the neurobiological mechanisms underlying memory disorders and confabulation in autoimmune encephalitis.

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