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Neurological, electrophysiological and MRI abnormalities in infants with extensive cystic leukomalacia
Insights
Early ultrasound and electrophysiological tests can predict visual and developmental outcomes in infants with cystic leukomalacia. This helps in understanding the long-term effects of periventricular leukomalacia (PVL) and other brain lesions.
Area of Science:
- Neonatal Neurology
- Pediatric Neuroimaging
- Developmental Neuroscience
Background:
- Cystic leukomalacia is a significant neonatal brain injury.
- Early diagnosis and prognosis are crucial for managing affected infants.
Purpose of the Study:
- To correlate early ultrasound and electrophysiological findings with later MRI and functional outcomes in infants with cystic leukomalacia.
- To differentiate prognostic patterns based on lesion type (periventricular leukomalacia vs. subcortical/mixed lesions).
Main Methods:
- Cranial ultrasound, visual evoked responses (VER), electroencephalograms (EEG) in neonates.
- Magnetic resonance imaging (MRI) in infancy.
- Correlation of early findings with later MRI and functional assessments.
Main Results:
- Periventricular leukomalacia (PVL) showed resolving cysts on ultrasound but delayed myelination on MRI, with preserved vision (though squint developed) and moderate developmental delay (spastic diplegia).
- Subcortical/mixed lesions persisted on ultrasound, showed poor myelination and cortical atrophy on MRI, leading to cortical blindness and severe intellectual disability (quadriplegia).
- Early EEG findings varied but generally improved in PVL, while remaining severely abnormal in mixed/subcortical lesions.
Conclusions:
- An integrated approach using neonatal ultrasound, EEG, and VER, followed by later infant MRI, offers reliable prediction of neurodevelopmental deficits.
- Distinguishing between PVL and subcortical/mixed lesions is critical for predicting the severity and pattern of long-term disabilities.
Abstract:
Twenty infants, diagnosed by cranial ultrasound as having extensive cystic leukomalacia, had visual evoked responses (VER) and electroencephalograms (EEG) in the neonatal period and MRI scans later in infancy. The early ultrasound findings and results from the electrophysiological tests were correlated with later MRI findings and functional abilities. In infants with periventricular leukomalacia (PVL), the cysts were usually no longer visible by ultrasonography, beyond 40 weeks postmenstrual age (PMA), but later MRI scans showed a consistent pattern of delayed myelination around the irregularly dilated occipital horns of the lateral ventricles. VER's were present in the neonatal period and vision was maintained, although all infants developed a marked squint. EEG's were either normal or abnormal initially, but improvement was noted within several weeks. In those with subcortical or mixed lesions, cysts were noted to persist beyond 40 weeks PMA. Later MRI scans showed very poor myelination, with poor progress on subsequent scans and cortical atrophy. VER's were absent and all infants later became cortically blind. EEG's were severely abnormal and recovery was very poor. The infants with PVL developed spastic diplegia with moderate developmental delay, while those with mixed or subcortical lesions developed quadriplegia with severe mental retardation. An integrated approach, consisting of ultrasound imaging and electrophysiological recordings in the neonatal period and MRI imaging later in infancy, may provide a more reliable prediction of the pattern of later deficits.