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Early MR detection of cortical and subcortical hypoxic-ischemic encephalopathy in full-term-infants
C Christophe1, A Clercx, D Blum
1Department of Pediatric Radiology, Hôpital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles, Belgium.
Insights
Magnetic resonance imaging (MRI) can detect early brain damage in newborns with hypoxic-ischemic encephalopathy (HIE). Postnatal MRI findings correlate with later outcomes like cortical atrophy and delayed myelination.
Area of Science:
- Neonatal neurology
- Neuroradiology
- Pediatric neuroimaging
Background:
- Hypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal brain injury.
- Early detection of neuropathologic lesions is crucial for timely intervention.
- Multiple types of brain lesions can coexist in affected newborns.
Purpose of the Study:
- To illustrate the potential of Magnetic Resonance (MR) imaging in the early detection of neuropathologic lesions in term newborns with severe HIE.
- To describe characteristic MR imaging findings in the postnatal period.
- To correlate early MR findings with long-term outcomes.
Main Methods:
- Utilized MR imaging to evaluate full-term newborns with severe hypoxic-ischemic encephalopathy (HIE).
- Analyzed proton-density-, T1-weighted, and T2-weighted MR images for specific lesion patterns.
- Conducted follow-up MR examinations several months later to assess chronic changes.
Main Results:
- Demonstrated diffuse, postnatal involvement of the cerebral cortex and subcortical white matter (WM).
- Identified cortical hyperintensity (proton-density and T1-weighted images) likely due to cellular necrosis.
- Observed subcortical WM hyperintensity (proton-density images) indicating increased water concentration (infarct/edema).
- Detected diffuse WM changes (low T1, high T2 intensity) suggestive of cytotoxic/vasogenic edema.
Conclusions:
- MR imaging is valuable for early detection of diverse neuropathologic lesions in HIE.
- Postnatal MR findings, including cortical and white matter abnormalities, predict long-term outcomes.
- The severity of early lesions on MR imaging correlates with the degree of cortical atrophy and myelination delay observed later.
Abstract:
Four observations illustrate the potential of MR imaging in the early depiction of multiple types of neuropathologic lesions which may coexist in the full-term newborn, upon severe hypoxic-ischemic encephalopathy (HIE). In particular, diffuse, postnatal involvement of cerebral cortex and subcortical white matter (WM) is demonstrated. Cortical hyperintensity on both proton-density- and T1-weighted images is probably related to cellular necrosis which is distributed diffusely or parasagittally. Hyperintense, frontal, subcortical WM edging on proton-density-weighted images results from the increase of water concentration, induced either by infarct or by edema. Diffuse WM areas of low intensity on T1-weighted images and of high intensity on T2-weighted images are presumably related to cytotoxic and/or vasogenic edema, proportional to the underlying damaged tissues. On follow-up MR examinations, several months later, the importance of cortical atrophy and of the myelination delay appeared related to the importance of the lesions detected during the postnatal period.