5 year old male patient with developmental delay and focal epilepsy. Evaluate for structural abnormalities. There is abnormal T2/FLAIR signal involving the subcortical white matter of the left posterior frontal lobe, with blurring at the gray-white junction, and linear signal abnormality extending from the cortex to the lateral ventricle (transmantle sign). Portion of the signal abnormality appears to involve the lateral aspect of the left precentral gyrus.Remainder of the brain parenchyma including the hippocampi appear unremarkable. No intracranial mass or mass effect. No evidence of ischemia or hemorrhage. Ventricles are within normal limits. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
Evidence of focal cortical dysplasia within the posterior left frontal lobe as described above. 