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[Usefulness and limitations of neuroradiologic tests (CT, US, MRI) in periventricular leukomalacia]
A Tartaro1, G Sabatino, C Delli Pizzi
1Istituto di Scienze Radiologiche, Università, Chieti.
Insights
Ultrasound (US) effectively images periventricular leukomalacia (PVL) in acute and middle phases. MR imaging excels at detecting delayed myelination and white matter abnormalities in older infants with PVL.
Area of Science:
- Neonatal neurology
- Pediatric radiology
Background:
- Periventricular leukomalacia (PVL) is a common neonatal brain injury.
- Early detection and characterization of PVL are crucial for management.
Purpose of the Study:
- To compare the efficacy of ultrasound (US), MR imaging, and CT scans in evaluating PVL in young patients.
- To assess the ability of different imaging modalities to detect PVL and its sequelae.
Main Methods:
- Retrospective analysis of 16 young patients with clinical and radiological signs of PVL.
- Investigation using MR imaging, US (in the perinatal period for 12 patients), and CT scans.
- Evaluation of imaging findings in acute, middle, and later phases of PVL.
Main Results:
- US provided precise anatomical details of PVL in acute and middle phases, showing hyperechoic areas evolving into anechoic cavities.
- MR imaging and CT showed no advantage over US in the acute phase but detected periventricular damage by 6-7 months.
- MR imaging was superior to CT in detecting delayed myelination; inversion-recovery sequences enhanced visualization of white matter abnormalities.
- Spin-echo proton-density images identified periventricular gliosis as hyperintense areas.
- CT aided in differentiating ischemic from hemorrhagic lesions in the acute phase, following US detection.
Conclusions:
- US is valuable for early PVL assessment.
- MR imaging offers superior detail for evaluating white matter changes and myelination status in later stages.
- Multimodal imaging approaches, combining US, CT, and MR, provide comprehensive evaluation of PVL and its long-term effects.
Abstract:
Sixteen young patients, with clinical and radiological signs of periventricular leukomalacia (PVL), were investigated with MR imaging. Twelve of them were investigated with US in the perinatal period. The extant 4 patients, older than the others, had a clinical history of PVL. US scans were capable of yielding precise information about the anatomical features of PVL in both the acute and the middle phases. The lesions appeared as hyperechoic areas which subsequently turned to anechoic cavities. MR imaging and CT scans did not present any particular advantage over US scans in the acute phase, but they did detect periventricular damage when the patient was 6-7 months old. MR imaging was superior to CT in detecting the delayed myelination of white matter. Inversion-recovery sequences gave more anatomical details to distinguish normal from abnormal white matter. Spin-echo proton-density images detected periventricular gliosis, which appeared as persistent hyperintense areas. CT might be useful in the acute phase, after US detection of hyperechoic intraparenchymal areas, for it allowed purely ischemic lesions to be distinguished from hemorrhagic ones.