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Cerebral abnormalities in congenital myotonic dystrophy
A Garcia-Alix1, F Cabañas, C Morales
1Department of Pediatrics, La Paz Children's Hospital, Madrid, Spain.
Insights
Congenital myotonic dystrophy in infants often causes ventricular dilation and macrocephaly. These brain abnormalities may stem from external hydrocephalus, impacting neonatal outcomes.
Area of Science:
- Neurology
- Pediatrics
- Medical Imaging
Background:
- Congenital myotonic dystrophy (CDM) is a severe genetic disorder.
- Neurological complications in CDM are not fully understood.
- Brain structure abnormalities require further investigation.
Purpose of the Study:
- To evaluate brain structure in infants with CDM using cranial ultrasonography.
- To correlate imaging findings with clinical and neuropathologic data.
- To identify potential origins of observed brain abnormalities.
Main Methods:
- Cranial ultrasonography was performed on 14 infants with CDM.
- Findings were correlated with clinical data and neuropathologic examinations.
- Ultrasound scans analyzed ventricular size and interhemispheric fissure width.
Main Results:
- Ventricular dilation occurred in 78% of infants.
- Macrocephaly was observed in 71%, often with ventricular dilation.
- Neuropathologic examination showed minor neuronal migrational disturbances.
Conclusions:
- Macrocephaly and ultrasonographic findings suggest external hydrocephalus in CDM.
- These abnormalities may originate from external hydrocephalus.
- Further research is needed to understand the pathogenesis and implications.
Abstract:
The brain structure of 14 infants born with congenital myotonic dystrophy at 2 hospitals was evaluated by cranial ultrasonography, and the findings were correlated with clinical and neuropathologic data. Ventricular dilation was diagnosed in 11 infants (78%). Seven infants died during the neonatal period; all had ventricular dilation which remained essentially static. In the ultrasound scans of the 5 infants with ventricular dilation. Of the 7 survivors, 4 had ventricular dilation born at 1 hospital, 4 had widening of the interhemispheric fissure. Macrocephaly, a previously unrecognized finding in congenital myotonic dystrophy, was present in 10 infants (71%), 8 of whom presented with ventricular dilation. None had clinical evidence of increased intracranial pressure. There was no ventricular obstruction in the 4 brains examined pathologically. Histologic examination revealed minor expression of neuronal migrational disturbances in each patient. Macrocephaly together with the ultrasonographic and neuropathologic findings in our patients suggest that these abnormalities may originate in an external hydrocephalus.