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Chapter 14 - Structural Imaging of Insular Epilepsy

from Section 3 - Noninvasive Investigation of Insular Epilepsy

Published online by Cambridge University Press:  09 June 2022

By
Andreas V. Alexopoulos
Edited by
Dang Nguyen ,
Jean Isnard  and
Philippe Kahane
Dang Nguyen
Affiliation:
Université de Montréal
Jean Isnard
Affiliation:
Claude Bernard University Lyon
Philippe Kahane
Affiliation:
Grenoble-Alpes University Hospital
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Summary

Structural brain MRI is an indispensable tool in the diagnosis and management of patients with insular epilepsy. Similar to the pathology of other focal epilepsies MRI lesions span from the obvious to the occult cortical malformations, along with vascular malformations, neoplasms, encephaloclastic lesions (e.g., after stroke or trauma), and less frequent etiologies including Rasmussen encephalitis. The incidence of MRI-negative focal epilepsy arising from the insula is unknown. Appropriate epilepsy MRI protocol is a necessary, but not sufficient requirement for the structural exploration of the insula. Interpretation of the study strongly depends on the reader’s expertise in imaging of epilepsy. Advances in image processing and multimodality imaging have increased the diagnostic yield of MRI studies in nonlesional insular epilepsies and in particular in patients with occult focal cortical dysplasia, including bottom of the sulcus dysplasia. The utility of emerging approaches, such as 7-Tesla and quantitative MRI studies, in the evaluation of insular epilepsies is now being explored. Finally, the importance of re-interpreting each visually identifiable MRI lesion or postprocessing MRI finding in the context of the individual clinical presentation cannot be overemphasized.

Keywords

insular epilepsyneuroimagingstructural MRIadvanced MRIquantitative MRIhigh field MRI
Type
Chapter
Information
Insular Epilepsies , pp. 163 - 178
Publisher: Cambridge University Press
Print publication year: 2022

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