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Lead encephalopathy in an infant mimicking a neurometabolic disorder

Jitendra K Sahu1, Suvasini Sharma, Mahesh Kamate

  • 1Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India.

Journal of Child Neurology
|July 28, 2009
PubMed

Insights

This case study reveals severe lead poisoning in a 7-month-old infant presenting with neurological symptoms. Environmental lead exposure from home-based battery manufacturing caused diffuse brain changes, highlighting the need for occupational history in diagnosing encephalopathy.

Area of Science:

  • Pediatric Neurology
  • Environmental Toxicology
  • Neuroimaging

Background:

  • Lead poisoning is a significant environmental health hazard, particularly affecting children.
  • Neurological manifestations in infants can be severe and mimic other conditions.
  • Occupational exposures can lead to household environmental contamination.

Observation:

  • A 7-month-old infant presented with developmental regression, seizures, altered sensorium, and vomiting, with a history of an elder sibling with similar symptoms.
  • Investigations revealed microcytic hypochromic anemia and dense metaphyseal bands on wrist radiography, suggestive of lead exposure.
  • Brain MRI demonstrated extensive, previously undescribed diffuse dysmyelination in both periventricular and subcortical white matter.

Findings:

  • The child's father was involved in illicit home-based lead-acid battery manufacturing, indicating a likely source of lead exposure.
  • The infant's clinical presentation and neuroimaging findings were consistent with severe lead encephalopathy.
  • Chelation therapy combined with environmental modification led to significant clinical improvement.

Implications:

  • This case underscores the critical importance of obtaining detailed occupational and environmental histories in pediatric cases of unexplained encephalopathy.
  • It highlights the potential for severe neurological damage, including diffuse dysmyelination, from chronic environmental lead exposure.
  • Early diagnosis and intervention, including source control and chelation therapy, are crucial for improving outcomes in childhood lead poisoning.

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