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Granulomatous amebic encephalitis: an under-recognized cause of infectious mortality after hematopoietic stem cell

G Akpek1, A Uslu, T Huebner

  • 1Marlene and Stewart Greenebaum Cancer Center, University of Maryland, Baltimore, Maryland 21201, USA. gakpek@umm.edu

Transplant Infectious Disease : an Official Journal of the Transplantation Society
|February 23, 2011
PubMed

Insights

Granulomatous amebic encephalitis (GAE) is a rare, fatal brain infection. Early diagnosis and treatment in hematopoietic stem cell transplant (HSCT) patients are crucial for potential survival.

Area of Science:

  • Infectious Diseases
  • Neurology
  • Transplantation Medicine

Background:

  • Granulomatous amebic encephalitis (GAE) is a rare and often fatal central nervous system infection caused by Acanthamoeba.
  • Its occurrence and clinical features in hematopoietic stem cell transplant (HSCT) recipients are poorly understood.
  • Immune compromise, common in HSCT patients, increases susceptibility to opportunistic infections like GAE.

Observation:

  • This study presents a case of GAE diagnosed post-mortem in an HSCT recipient.
  • A systematic review of prior GAE cases in HSCT patients was conducted.
  • Clinical presentations, diagnostic challenges, and risk factors were analyzed.

Findings:

  • GAE in HSCT recipients often presents insidiously, initially affecting the skin or lungs over months.
  • Rapid progression to the brain, leading to fatality, occurs once the blood-brain barrier is breached.
  • Delayed diagnosis, often post-mortem, is common due to low awareness and non-specific initial symptoms.
  • Subcutaneous nodules, eosinophilia, and a history of rhinitis/sinusitis may indicate amebic infection.
  • Risk factors include corticosteroid use and exposure to contaminated water.

Implications:

  • Increased awareness of GAE is needed among clinicians managing HSCT patients.
  • Early recognition of subtle signs, such as skin nodules and eosinophilia, is vital for prompt diagnosis.
  • Aggressive, combination therapy initiated early offers the best chance for successful outcomes in GAE.
  • Further research is needed to define optimal diagnostic and treatment strategies for GAE in immunocompromised populations.

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