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Research ArticlePediatric Neuroimaging

Decline in Corpus Callosum Volume among Pediatric Patients with Medulloblastoma: Longitudinal MR Imaging Study

Shawna L. Palmer, Wilburn E. Reddick, John O. Glass, Amar Gajjar, Olga Goloubeva and Raymond K. Mulhern
American Journal of Neuroradiology August 2002, 23 (7) 1088-1094;
Shawna L. Palmer
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Wilburn E. Reddick
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John O. Glass
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Amar Gajjar
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Olga Goloubeva
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Raymond K. Mulhern
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Abstract

BACKGROUND AND PURPOSE: A decline in intrahemispheric cerebral white matter volume in children treated for brain tumors with cranial irradiation has been well documented. It was hypothesized that the development of the corpus callosum, the largest white matter commissure of the brain, would also be adversely affected after treatment with cranial irradiation in pediatric patients treated for medulloblastoma.

METHODS: After diagnosis, 35 patients (22 male and 13 female patients) with histologically proved medulloblastoma were treated by maximal surgical resection, risk-adapted craniospinal irradiation, and chemotherapy. Using quantitative measurement techniques with MR imaging, corpus callosum volume was measured at multiple time points for each patient during a 4-year period.

RESULTS: Quantitative MR imaging analyses of 239 examinations in 35 patients showed, in contrast to normal development, that the total midsagittal corpus callosum area decreased with time from craniospinal irradiation (−18.0 mm2/y; P < .0001). After examination of seven corpus callosum subregions, significant declines were also observed: genu (−2.2 mm2/y; P = .03), rostral body (−2.0 mm2/y; P = .04), anterior midbody (−1.4 mm2/y; P = .005), posterior midbody (−1.2 mm2/y; P = .004), isthmus (−2.4 mm2/y; P = .001), and splenium (−5.0 mm2/y; P = .007).

CONCLUSION: The greatest deviation from normal development occurred in the most posterior subregions of the corpus callosum: the isthmus and the splenium. These corpus callosum subregions, associated with fibers traversing from the temporal, posterior parietal, and occipital lobes, are normally expected to have the highest rate of growth during childhood. However, these regions also received the highest total dose of irradiation, providing a possible explanation for atypical corpus callosum development observed in these 35 patients treated for medulloblastoma.

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American Journal of Neuroradiology: 23 (7)
American Journal of Neuroradiology
Vol. 23, Issue 7
1 Aug 2002
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Cite this article
Shawna L. Palmer, Wilburn E. Reddick, John O. Glass, Amar Gajjar, Olga Goloubeva, Raymond K. Mulhern
Decline in Corpus Callosum Volume among Pediatric Patients with Medulloblastoma: Longitudinal MR Imaging Study
American Journal of Neuroradiology Aug 2002, 23 (7) 1088-1094;

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Decline in Corpus Callosum Volume among Pediatric Patients with Medulloblastoma: Longitudinal MR Imaging Study
Shawna L. Palmer, Wilburn E. Reddick, John O. Glass, Amar Gajjar, Olga Goloubeva, Raymond K. Mulhern
American Journal of Neuroradiology Aug 2002, 23 (7) 1088-1094;
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  • Clinical, Histopathologic, and Molecular Markers of Prognosis: Toward a New Disease Risk Stratification System for Medulloblastoma
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