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Subcortical nodular heterotopia. A: Contrast-enhanced axial computed tomography shows a large right fronto-parietal, non-enhancing mass exerting mass effect on the right lateral ventricle; B-D:Non-contrast enhanced magnetic resonance imaging (B), axial T1W, (C) axial T2W and (D) coronal T2W images showing a large subcortical nodular mass, isointense to the cortical gray matter. The overlying cortex is thin and the corpus callosum is agenetic.
