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Periventricular leukomalacia: correlation between MR imaging and autopsy findings during the first 2 months of life
E Schouman-Claeys1, M C Henry-Feugeas, F Roset
1Department of Radiology, Raymond Poincaré Hospital, Garches, France.
Purpose:
To correlate magnetic resonance (MR) imaging and pathologic findings in premature infants with periventricular leukomalacia (PVL).
Materials And Methods:
Eight premature infants with PVL who died after 3-7 weeks of life were studied with in vivo T1-weighted MR imaging, and imaging patterns were compared with hypoxic-ischemic injuries at pathologic analysis.
Results:
Cavities were seen as zones of absent or weak signal intensity. Translucent sparsely cellular zones appeared as areas of intermediate intensity, and cellular reactions were seen as limited linear or punctate zones of increased intensity, usually less intense than the cortex. MR imaging provided reliable depiction of these lesions, with adequate estimation of their volume and topography. However, the extent of periventricular cellular lesions was underestimated. In one case, blood seen as hyperintense or isointense zones masked portions of cystic lesions, and in three cases small thalamic lesions were overlooked.
Conclusion:
With the above limitations, T1-weighted MR imaging offers precise evaluation of PVL.
Insights
T1-weighted MR imaging accurately depicts periventricular leukomalacia (PVL) in premature infants, though it may underestimate lesion extent and overlook small thalamic injuries.
Area of Science:
- Neonatal neurology
- Pediatric radiology
- Neuroimaging
Background:
- Periventricular leukomalacia (PVL) is a common neurological injury in premature infants.
- Accurate assessment of PVL is crucial for understanding its impact and guiding management.
Purpose of the Study:
- To correlate magnetic resonance (MR) imaging findings with pathologic results in premature infants diagnosed with PVL.
- To evaluate the efficacy of T1-weighted MR imaging in depicting PVL lesions.
Main Methods:
- Eight premature infants with PVL were studied using in vivo T1-weighted MR imaging.
- MR imaging patterns were compared with postmortem pathologic findings of hypoxic-ischemic injuries.
Main Results:
- MR imaging reliably depicted PVL cavities as signal intensity zones.
- Lesion volume and topography were adequately estimated, but cellular lesion extent was underestimated.
- Blood artifacts and small thalamic lesions were occasionally missed.
Conclusions:
- T1-weighted MR imaging provides a precise evaluation of PVL in premature infants.
- Limitations include underestimation of lesion extent and potential oversight of certain lesions.