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Novel hypomyelinating leukoencephalopathy affecting early myelinating structures

Marjan E Steenweg1, Nicole I Wolf, Jolanda H Schieving

  • 1Department of Child Neurology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands.

Archives of Neurology
|January 11, 2012
PubMed
Abstract

Insights

Four children with a novel hypomyelinating leukoencephalopathy were identified through distinct MRI patterns. This rare neurological disorder affects early myelination, presenting with nystagmus and ataxia but normal cognition.

Area of Science:

  • Neuroscience
  • Genetics
  • Radiology

Background:

  • Leukodystrophies are a group of rare inherited disorders affecting white matter of the brain.
  • Hypomyelinating leukoencephalopathies are characterized by a reduced amount of myelin in the central nervous system.
  • Identifying novel forms of these disorders is crucial for understanding genetic and developmental pathways.

Purpose of the Study:

  • To describe a novel hypomyelinating leukoencephalopathy identified in four children.
  • To characterize the distinct magnetic resonance imaging (MRI) abnormalities associated with this condition.
  • To correlate the MRI findings with the clinical presentation and neurological development.

Main Methods:

  • Retrospective review of clinical and laboratory data from four unrelated patients.
  • Standardized rating of MRI scans to identify characteristic abnormalities.
  • Exclusion of known causes of hypomyelination.

Main Results:

  • Patients presented with a unique pattern of T2 hyperintensity in specific brain structures, including the brainstem, cerebellum, and white matter tracts.
  • Three patients showed alternating hyperintense-hypointense stripes in the internal capsule.
  • Clinical features included nystagmus, cerebellar ataxia, and mild spasticity, with normal cognition and language development.

Conclusions:

  • The consistent MRI pattern and clinical phenotype suggest a distinct, novel hypomyelinating leukoencephalopathy.
  • The observed hypomyelination primarily affects structures involved in early myelination.
  • A potential genetic defect in a gene crucial for early myelination is hypothesized.

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