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Necrotizing encephalopathy and macrocephaly with mitochondrial complex I deficiency.

F Feillet1, B Mousson, Y Grignon

  • 1Service de Médecine Infantile III, Hôpital d'Enfants, Nancy, France.

Pediatric Neurology
|May 18, 1999
PubMed
Summary

A neonate with vomiting and hypotonia had lactic acidosis and brain edema, indicating a severe mitochondrial disorder. Postmortem studies confirmed necrotizing encephalopathy due to mitochondrial complex I deficiency.

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Area of Science:

  • Biochemistry
  • Neurology
  • Pediatrics

Background:

  • Mitochondrial disorders are a group of heterogeneous genetic conditions affecting cellular energy production.
  • Neonatal presentation of mitochondrial diseases can be severe and rapidly progressive.
  • Lactic acidosis is a common metabolic derangement in infants with mitochondrial dysfunction.

Observation:

  • A neonate presented with vomiting, unresponsiveness, hypotonia, macrocephaly, and lactic acidosis.
  • Cranial CT scan showed a hypodense brain with increased volume and extensive cerebral edema.
  • Postmortem examination revealed necrotizing encephalopathy, brain edema, spongiosis, thalamic necrosis, and basal ganglia calcifications.

Findings:

  • Enzyme studies of the mitochondrial respiratory chain identified a deficiency in complex I activity.

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  • This complex I deficiency was present in both muscle and liver tissues.
  • The findings strongly implicate mitochondrial dysfunction as the cause of the observed pathology.

    • Implications:

    • This case highlights the critical role of mitochondrial complex I in early brain development and function.
    • Early diagnosis and understanding of mitochondrial disorders are crucial for potential interventions.
    • Further research into the genetic and biochemical basis of complex I deficiency is warranted.