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Neuroimaging Biomarkers and Neurocognitive Outcomes in Pediatric Medulloblastoma Patients: a Systematic Review

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Abstract

Medulloblastoma is a malign posterior fossa brain tumor, mostly occurring in childhood. The CNS-directed chemoradiotherapy treatment can be very harmful to the developing brain and functional outcomes of these patients. However, what the underlying neurotoxic mechanisms are remain inconclusive. Hence, this review summarizes the existing literature on the association between advanced neuroimaging and neurocognitive changes in patients that were treated for pediatric medulloblastoma. The PubMed/Medline database was extensively screened for studies investigating the link between cognitive outcomes and multimodal magnetic resonance (MR) imaging in childhood medulloblastoma survivors. A behavioral meta-analysis was performed on the available IQ scores. A total of 649 studies were screened, of which 22 studies were included. Based on this literature review, we conclude medulloblastoma patients to be at risk for white matter volume loss, more frequent white matter lesions, and changes in white matter microstructure. Such microstructural alterations were associated with lower IQ, which reached the clinical cut-off in survivors across studies. Using functional MR scans, changes in activity were observed in cerebellar areas, associated with working memory and processing speed. Finally, cerebral microbleeds were encountered more often, but these were not associated with cognitive outcomes. Regarding intervention studies, computerized cognitive training was associated with changes in prefrontal and cerebellar activation and physical training might result in microstructural and cortical alterations. Hence, to better define the neural targets for interventions in pediatric medulloblastoma patients, this review suggests working towards neuroimaging-based predictions of cognitive outcomes. To reach this goal, large multimodal prospective imaging studies are highly recommended.

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  1. Department of Pediatric Hematology and Oncology, University Hospitals Leuven, Leuven, Belgium

    Maarten Wauters, Anne Uyttebroeck & Sandra Jacobs

  2. Department of Oncology, KU Leuven, Leuven, Belgium

    Anne Uyttebroeck, Charlotte Sleurs & Sandra Jacobs

  3. Department of Pediatric Neurology, University Hospitals Leuven, Leuven, Belgium

    Liesbeth De Waele

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Correspondence to Charlotte Sleurs.

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Wauters, M., Uyttebroeck, A., De Waele, L. et al. Neuroimaging Biomarkers and Neurocognitive Outcomes in Pediatric Medulloblastoma Patients: a Systematic Review. Cerebellum 20, 462–480 (2021). https://doi.org/10.1007/s12311-020-01225-4

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  • DOI: https://doi.org/10.1007/s12311-020-01225-4

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