Functional MRI in Malformations of Cortical Development: Activation of Dysplastic Tissue and Functional Reorganization
Article first published online: 4 SEP 2007
© 2008 by the American Society of Neuroimaging
Journal of Neuroimaging
Volume 18, Issue 3, pages 296–305, July 2008
How to Cite
Vitali, P., Minati, L., D'Incerti, L., Maccagnano, E., Mavilio, N., Capello, D., Dylgjeri, S., Rodriguez, G., Franceschetti, S., Spreafico, R. and Villani, F. (2008), Functional MRI in Malformations of Cortical Development: Activation of Dysplastic Tissue and Functional Reorganization. Journal of Neuroimaging, 18: 296–305. doi: 10.1111/j.1552-6569.2007.00164.x
- Issue published online: 3 SEP 2008
- Article first published online: 4 SEP 2007
- Acceptance: Received January 6, 2007, and in revised form March 10, 2007. Accepted for publication April 29, 2007.
- Malformations of cortical development;
- functional MRI;
- functional reorganization
BACKGROUND AND PURPOSE
Functional neuroimaging and electrophysiological studies suggest that dysplastic neural tissue in malformations of cortical development may participate in task performance, and that functional organization can be altered beyond visible lesion boundaries. The aim of this work was to investigate cortical function in a heterogeneous group of patients with malformations of cortical development.
Twelve patients participated in the study, 2 for each of the following categories: subcortical, periventricular, and band heterotopia, unilateral and bilateral polymicrogyria, and focal cortical dysplasia. Functional magnetic resonance imaging was performed with finger tapping, somatosensory and visual stimulation, and language-related tasks.
We found activations within the dysplastic tissue in subcortical heterotopia, band heterotopia, and polymicrogyria, but not in periventricular heterotopic nodules. In one of the patients with focal cortical dysplasia, language-related activation involved part of the lesion. Functional reorganization beyond visible lesion boundaries was seen, with different patterns, in 4 patients.
In accordance with previous reports, our findings indicate that dysplastic neural tissue can be activated during task performance, and that in some patients, extensive functional reorganization occurs, highlighting the importance of functional magnetic resonance imaging in presurgical planning in those patients for whom epilepsy surgery is considered as an option.