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Evidence for altered basal ganglia and cortical functions in transient idiopathic dystonia
1Children's Hospital Medical Center, University of Bonn, Germany.
Insights
Transient infantile idiopathic dystonia, a rare movement disorder, presented with temporary basal ganglia dysfunction. Symptoms resolved by 16 months, suggesting a reversible neurological alteration in early childhood.
Area of Science:
- Neurology
- Pediatrics
- Movement Disorders
Background:
- Idiopathic dystonia with early-onset (infancy) is often transient, unlike later-onset forms.
- This case examines a unique presentation of infantile dystonia with normal development.
Observation:
- A 5-month-old girl exhibited brief, daily episodes of dystonic neck and arm postures.
- Neurological examinations and psychomotor development remained normal throughout.
- Standard metabolic tests and MRI scans yielded unremarkable results.
Findings:
- Functional imaging revealed reduced basal ganglia perfusion (SPECT) and metabolism (PET).
- SPECT also indicated decreased perfusion in the left temperomesial cortex.
- PET showed reduced glucose metabolism in the cerebellum.
- These functional deficits in the basal ganglia and other CNS regions were observed during symptomatic periods.
Implications:
- Functional neuroimaging (PET/SPECT) can detect transient alterations in basal ganglia and CNS function in early-onset dystonia.
- The findings support the concept of temporary neurological dysfunction in this specific pediatric movement disorder.
- Further research is warranted to understand the mechanisms and long-term outcomes of such transient functional changes.
Abstract:
Idiopathic dystonia with onset in the first year of life has been described as a transient movement disorder, in contrast to other forms of idiopathic dystonia We report on a girl who showed, from her 5th month, episodes of dystonic postures of her neck and arm, which lasted for seconds and occurred several times a day. Neurologic findings and the psychomotor development were and remained normal. Neurometabolic screening tests and cerebral magnetic resonance imaging showed normal results. Functional cerebral imaging showed decreased perfusion of the basal ganglia and the left temperomesial cortex using single photon emission computed tomography (SPECT with technetium 99m hexamethylpropyleneamine oxime [99mTc-HMPAO]) and decreased glucose metabolism in the basal ganglia and the cerebellum using positron emission tomography (PET with [18F]fluorodeoxyglucose [18FDG]). Follow-up revealed that the episodes disappeared at the age of 16 months. The findings of PET and SPECT give evidence of an alteration in basal ganglia function but also in functions of other central nervous system regions, which may, however, be temporary.