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Axial T1-weighted image (550/14/2 [TR/TE/excitations]) in the posterior frontal and parietal regions shows the abnormal sylvian fissures communicating across the midline over the vertex (black arrows). Flow-related enhancement is seen within branches of the middle cerebral arteries, confirming that this represents the sylvian fissure. Thickened dysplastic cortex is present along the anterior IHF (white arrows).
