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Bilateral symmetrical thick band of grey matter is seen deep to and running parallel to the cerebral cortex simulating the double cortex sign. Also, there is partial agenesis of corpus callosum. Overlying cortex exhibits mild shallowness of the sulci.
MRI findings are suggestive for subcortical heterotopia of the band / laminar heterotopia variety.
Case courtesy of Prof. Ahmad Alizade.