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Postinfectious encephalomyelitis: etiologic and diagnostic trends

K L Hung1, H T Liao, M L Tsai

  • 1Department of Pediatrics, Cathay General Hospital, Taipei, Taiwan, ROC. klhung@ms10.hinet.net

Journal of Child Neurology
|November 4, 2000
PubMed

Insights

Postinfectious encephalomyelitis in children has shifted from measles and mumps to Epstein-Barr virus and mycoplasma infections. Magnetic resonance imaging (MRI) is the preferred diagnostic tool.

Area of Science:

  • Pediatrics
  • Neurology
  • Infectious Diseases

Background:

  • Postinfectious encephalomyelitis (PIE) is a serious neurological complication following infections.
  • Understanding etiological shifts in PIE is crucial for diagnosis and management.
  • The introduction of the measles-mumps-rubella (MMR) vaccine in Taiwan in 1992 may have impacted PIE causes.

Purpose of the Study:

  • To analyze the changing trends in causative agents of PIE in children.
  • To describe the clinical manifestations and neuroimaging findings of PIE.
  • To evaluate the diagnostic utility of various neuroimaging techniques.

Main Methods:

  • Retrospective review of 50 pediatric PIE cases admitted between 1980 and 1997.
  • Analysis of antecedent infections, clinical symptoms, and neurological signs.
  • Evaluation of neuroimaging studies including computed tomography (CT), magnetic resonance imaging (MRI), somatosensory evoked potentials (SSEPs), and single photon emission computed tomography (SPECT).

Main Results:

  • The study identified a shift in PIE etiology from traditional exanthematous diseases (measles, rubella, mumps) to Epstein-Barr virus and Mycoplasma infections.
  • Common clinical symptoms included fever, headache, vomiting, seizures, and motor weakness.
  • MRI demonstrated higher lesion detection rates (82%) compared to CT (56%), with abnormalities seen in various brain regions. SSEPs and SPECT provided complementary diagnostic information in MRI-negative cases.

Conclusions:

  • The causative agents of PIE in Taiwan have evolved, with a decrease in vaccine-preventable diseases and an increase in other infections.
  • MRI is the imaging modality of choice for diagnosing PIE.
  • Neurophysiological and functional imaging techniques like SSEPs and SPECT can aid diagnosis when MRI findings are inconclusive.

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