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Updated: Jul 2, 2026
Mouse Models of Periventricular Leukomalacia
Published on: May 18, 2010
Fiber-tracking techniques can predict the degree of neurologic impairment for periventricular leukomalacia
Aki Murakami1, Masafumi Morimoto, Kei Yamada
1Department of Pediatrics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo, Kyoto 602-8566, Japan. akkylin@koto.kpu-m.ac.jp
Insights
Diffusion tensor imaging can identify white matter injury in infants with periventricular leukomalacia. Early detection using fractional anisotropy may improve motor function outcomes through timely intervention.
Area of Science:
- Neonatal neurology
- Neuroimaging
- Pediatric neurodevelopment
Background:
- Hypoxic-ischemic encephalopathy (HIE) in preterm or low birth weight infants can cause white matter injury, leading to periventricular leukomalacia (PVL).
- PVL can significantly impact long-term brain development and motor function.
- Current noninvasive methods for early assessment of HIE-induced injury severity are lacking.
Purpose of the Study:
- To evaluate the utility of diffusion tensor imaging (DTI) in assessing sensorimotor fiber integrity in infants with PVL.
- To correlate DTI findings with the severity of PVL and motor function outcomes.
Main Methods:
- Diffusion tensor imaging (DTI) was employed to examine sensorimotor pathways in 10 infants diagnosed with PVL.
- Region-of-interest (ROI) and tractography-based measurements of fractional anisotropy (FA) were performed.
- Motor function assessments were conducted at a mean age of 28 months.
Main Results:
- Fractional anisotropy (FA) values in the motor tract were significantly lower in severe PVL cases compared to mild cases.
- An FA cutoff value of <0.5 demonstrated utility in predicting severe PVL.
- Tractography-based measurements were found to be more sensitive than ROI measurements for assessing injury.
Conclusions:
- Fiber-tracking techniques, specifically DTI, offer valuable insights into the pathophysiology of motor deficits in PVL.
- Early screening using DTI in infants with a history of perinatal asphyxia can enable timely interventions, such as rehabilitation, to potentially improve motor function.
Objective:
Preterm or low birth weight infants display a greater propensity for white matter injury caused by hypoxic-ischemic encephalopathy in the perinatal period. Such episodes can result in periventricular leukomalacia, which may substantially influence later brain development. Noninvasive methods of assessing the severity of injury at the earliest stage of life have not yet been established.
Methods:
We used diffusion tensor imaging to evaluate sensorimotor fibers in periventricular leukomalacia. Region-of-interest measurements and tractography-based measurements were performed for 10 patients with periventricular leukomalacia. The mean age of the patients was 19 +/- 9.5 months (range: 9-41 months). Motor functions were assessed at a mean age of 28 +/- 14.5 months.
Results:
Measured fractional anisotropy values of the motor tract were significantly higher in all mild periventricular leukomalacia cases than in severe cases. A fractional anisotropy cutoff value of <0.5 was useful for predicting severe periventricular leukomalacia. Region-of-interest measurements were less sensitive, compared with tractography-based measurements.
Conclusions:
Fiber-tracking techniques can provide information on the pathophysiologic features of motor disability in patients with periventricular leukomalacia. Early screening of patients with a history of asphyxia may facilitate early intervention (eg, rehabilitation), to achieve better motor function.
