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Neuroradiological findings in children with congenital myotonic dystrophy
Insights
Congenital myotonic dystrophy in children shows brain abnormalities like periventricular hyperintensity, often linked to birth asphyxia. However, this brain damage does not correlate with neurodevelopmental outcomes.
Area of Science:
- Pediatric Neurology
- Neuroimaging
- Genetic Disorders
Background:
- Congenital myotonic dystrophy (CDM) is a severe inherited neuromuscular disorder.
- Neurological complications in CDM are significant but not fully understood.
- Brain imaging and neurodevelopmental assessment are crucial for understanding CDM's impact.
Purpose of the Study:
- To analyze brain imaging findings in children with CDM.
- To assess neurological development from the neonatal period.
- To investigate the relationship between brain abnormalities, perinatal events, and neurodevelopmental outcomes.
Main Methods:
- Studied seven children with CDM (aged 2.1-8.3 years).
- Analyzed computed tomography (CT) and magnetic resonance imaging (MRI) of the brain.
- Assessed neurological development from the neonatal period.
Main Results:
- Ventricular dilatation observed in infancy did not progress.
- Periventricular hyperintensity on MRI was present in all children.
- Subcortical hyperintensity was seen in one child.
- Periventricular hyperintensity correlated significantly with Apgar scores, indicating a link to perinatal asphyxia.
- No correlation found between neurodevelopmental outcome and imaging findings (hyperintensity or ventriculomegaly).
Conclusions:
- Neonatal asphyxia can cause periventricular hyperintensity in CDM patients.
- Brain damage from perinatal asphyxia is unlikely to be a primary cause of intellectual disability in CDM.
- Further research is needed to understand the specific neurological deficits in CDM.
Abstract:
We studied seven children with congenital myotonic dystrophy, aged 2.1-8.3 years, and the results of computed tomography and magnetic resonance imaging of the brain were analyzed and neurological development was assessed from the neonatal period. We found that ventricular dilatation that had been seen on the first day of life in two of three infants had not progressed in sequential follow-up computed tomography scans taken at intervals of one to six years. Also, in T2-weighted magnetic resonance imagings, areas of periventricular hyperintensity were identified in all children, as well as areas of subcortical hyperintensity in one child. Further, an asphyxial episode had occurred at birth in five patients and the extent of the periventricular hyperintensity was found to correlate significantly with Apgar scores, indicating that the degree of perinatal asphyxia that had occurred was responsible for the abnormalities uncovered by the magnetic resonance imagings. However, there was no correlation between the neurodevelopment outcome and the extent of the periventricular hyperintensity or ventriculomegaly. Therefore, in patients with congenital myotonic dystrophy, a neonatal episode of asphyxia can be responsible for a finding of periventricular hyperintensity, but it is unlikely that an integral part of the mental retardation is attributable to brain damage due to perinatal asphyxia.