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CD8 Encephalitis: A Diagnostic Dilemma.

Rohan Sharma1, Thomas Spradley2, Morgan Campbell3

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|November 11, 2022
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Summary
This summary is machine-generated.

CD8+ encephalitis, a brain inflammation linked to HIV, can occur after other infections like herpes simplex encephalitis. A brain biopsy confirmed this rare diagnosis in a patient with persistent neurological symptoms.

Keywords:
CD8 encephalitisHIVHSVencephalitis

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Area of Science:

  • Neuroimmunology
  • Infectious Diseases
  • Neurology

Background:

  • CD8+ encephalitis is a subacute encephalopathy associated with Human Immunodeficiency Virus (HIV) infection.
  • Pathophysiology is hypothesized to involve auto-reactive CD8+ T-cells targeting HIV-infected CD4+ cells and viral escape mechanisms.
  • This condition presents a diagnostic challenge due to its complex interplay with viral infections and immune responses.

Observation:

  • A 45-year-old male with well-controlled HIV presented with persistent encephalopathy, status epilepticus, and agitated delirium.
  • The patient's neurological decline followed an episode of Herpes simplex encephalitis.
  • Initial diagnostic workup did not readily identify the cause of the prolonged encephalopathy.

Findings:

  • A brain biopsy was crucial in confirming the diagnosis of CD8+ encephalitis.
  • The case highlights a potential link between prior Herpes simplex encephalitis and the subsequent development of CD8+ encephalitis in an HIV-positive individual.
  • Confirmation of CD8+ T-cell infiltration and reactivity was key to establishing the diagnosis.

Implications:

  • This case underscores the importance of considering CD8+ encephalitis in HIV-infected patients with unexplained encephalopathy, particularly after other CNS infections.
  • Understanding the interplay between different viral infections and immune responses in the CNS is critical for accurate diagnosis and management.
  • Further research into the specific triggers and mechanisms of CD8+ encephalitis may lead to improved diagnostic strategies and targeted therapies.