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[Granulomatous amebic encephalitis caused by Balamuthia mandrillaris. First case diagnosed in Chile]

David Oddó B1, Susana Ciani A, Pablo Vial C

  • 1Departamento de Anatomía Patológica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile. dvoddopatologo@hotmail.com

Revista Chilena De Infectologia : Organo Oficial De La Sociedad Chilena De Infectologia
|August 10, 2006
PubMed

Insights

A rare case of granulomatous amebic encephalitis (GAE) in an infant is presented. The study identifies Balamuthia mandrillaris as the causative agent of this fatal necrotizing encephalitis.

Area of Science:

  • Neurology
  • Infectious Diseases
  • Pathology

Background:

  • Granulomatous amebic encephalitis (GAE) is a rare, severe infection of the central nervous system.
  • It is caused by free-living amoebae, primarily Balamuthia mandrillaris and Acanthamoeba species.
  • GAE predominantly affects immunocompromised individuals but can occur in immunocompetent hosts.

Observation:

  • A 7-month-old infant presented with personality changes, convulsions, and fever.
  • Brain imaging revealed multifocal, non-mass-effecting cavity lesions.
  • Biopsy confirmed necrotizing encephalitis; autopsy showed extensive disease with parasitic elements.

Findings:

  • Morphological analysis identified trophozoites and cysts consistent with free-living amoebae.
  • The causative agent was identified as Balamuthia mandrillaris.
  • Associated findings included necrotizing arteritis, thymic hypoplasia-dysplasia, and signs of shock.

Implications:

  • This case highlights the potential for Balamuthia mandrillaris to cause severe GAE in infants.
  • Early diagnosis and treatment are crucial, though outcomes remain poor.
  • Further research into Balamuthia mandrillaris pathogenesis and treatment strategies is warranted.

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