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Dopa-responsive dystonia simulating cerebral palsy

T G Nygaard1, S P Waran, R A Levine

  • 1Department of Neurology, Columbia University College of Physicians & Surgeons, New York, New York.

Pediatric Neurology
|October 1, 1994
PubMed
Summary

Dopa-responsive dystonia can mimic cerebral palsy in children. Prompt diagnosis and levodopa treatment lead to significant functional recovery, highlighting the importance of considering this treatable condition.

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Area of Science:

  • Neurology
  • Pediatrics
  • Genetics

Background:

  • Children presenting with motor impairments often receive initial diagnoses such as spastic diplegia or cerebral palsy.
  • Dopa-responsive dystonia (DRD) is a rare genetic neurometabolic disorder that can present with symptoms mimicking cerebral palsy.
  • Early identification of DRD is crucial for effective treatment and improved patient outcomes.

Purpose of the Study:

  • To investigate the clinical presentation and diagnostic challenges of dopa-responsive dystonia in children.
  • To evaluate the efficacy of levodopa therapy in patients initially diagnosed with atypical cerebral palsy.
  • To highlight the importance of considering DRD in the differential diagnosis of pediatric movement disorders.

Main Methods:

  • Case series analysis of five pediatric patients with unexplained motor deficits.

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  • Clinical examination, assessment of neurological signs (pyramidal and extrapyramidal), and developmental milestones.
  • Cerebrospinal fluid analysis for neurotransmitter metabolites (biopterin, neopterin, homovanillic acid) and therapeutic trial with levodopa.

    • Main Results:

    • Four out of five patients showed reduced levels of biopterin, neopterin, and homovanillic acid in cerebrospinal fluid.
    • Levodopa therapy resulted in rapid and significant improvement in motor function, resolving symptoms like "spasticity" and extrapyramidal signs within six months.
    • Diagnosis of dopa-responsive dystonia was confirmed by the positive response to levodopa treatment.

    Conclusions:

    • Dopa-responsive dystonia should be considered in the differential diagnosis of children with unexplained or atypical cerebral palsy.
    • The study underscores the effectiveness of levodopa in treating DRD, leading to substantial functional recovery.
    • Infantile onset with delayed motor milestones can occur in DRD, expanding the typical presentation spectrum.