Clinical findings and white matter abnormalities seen on diffusion tensor imaging in adolescents with very low birth weight
1Department of Laboratory Medicine, Children's and Women's Health, 2Department of Neuroscience, 3Department of Circulation and Medical Imaging, Medical Faculty, Norwegian University of Science and Technology, 4St Olav's University Hospital, Trondheim, 5Department of Pediatrics, Sørlandet Hospital, Arendal, 6Department of Radiology, Institute of Clinical Medicine, Medical Faculty, University of Tromsø, Tromsø, Norway and 7UCSD Department of Neurosciences and Radiology, La Jolla, CA, USA
Correspondence to: Jon Skranes, MD PhD, Department of Laboratory Medicine, Children's and Women's Health, Norwegian University of Science and Technology, 7041 Trondheim, Norway E-mail: jon.skranes{at}ntnu.no
Very low birth weight (VLBW) children are at high risk of perinatal white matter injury, which, when subtle, may not be seen using conventional magnetic resonance imaging. The relationship between clinical findings and fractional anisotropy (FA) measurements in white matter of adolescents born prematurely with VLBW was studied in 34 subjects (age = 15 years, birth weight 
1500 g) and 47 age-matched controls born at term, who were examined both clinically and with diffusion tensor imaging (DTI). Perceptual and cognitive functions were evaluated by visual motor integration (VMI) with supplementary tests and sub-tests from WISC-III, motor function by movement ABC and Grooved Pegboard test and psychiatric symptoms by the schedule for affective disorders and schizophrenia for school-age children semistructured interview, the Autism Spectrum Screening Questionnaire and attention deficit hyperactivity disorder (ADHD) rating scale IV. Overall functioning was scored on the children's global assessment scale. DTI scans were performed for calculation of FA maps and areas of significant differences in mean FA values between subjects and controls were compared with their clinical data. The VLBW children had reduced FA values in the internal and external capsule, corpus callosum and superior, middle superior and inferior fasciculus. Within this group of children, visual motor and visual perceptual deficits were associated with low FA values in the external capsule, posterior part of the internal capsule and in the inferior fasciculus. Children with low IQ had low FA values in the external capsule and inferior and middle superior fasciculus. Fine motor impairment was related to low FA values in the internal and external capsule and superior fasciculus. Eight VLBW children with inattention symptoms or a diagnosis of ADHD had significantly lower FA values in several areas. Mild social deficits correlated with reduced FA values in the external capsule and superior fasciculus. We conclude that DTI was able to detect differences in FA between VLBW adolescents and controls in several white matter areas at risk of periventricular leucomalacia in VLBW newborns. Our results show that low FA values in these areas were associated with perceptual, cognitive, motor and mental health impairments. These conclusions indicate that perinatal injury of white matter tracts persist with clinical significance in adolescence.
Key Words: VLBW; DTI; adolescents; FA maps
Abbreviations: DTI, diffusion tensor imaging; FA, fractional anisotropy; PVL, periventricular leucomalacia; VLBW, very low birth weight
Received October 11, 2006. Revised December 5, 2006. Accepted January 4, 2007.
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