Neuronal Migration Anomalies Causing Extensive Ventricular Indentation

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Abstract
Neuronal migration disorders include various anomalies of the brain, and cortical heterotopia is the most common type. In this report, we present the radiological findings of two adults with unusually large cortical heterotopia associated with fused-lip schizencephaly that caused extensive ventricular indentation. The lesion showed density on a computed tomographic scan and signal intensity on a magnetic resonance imaging scan similar to normal gray matter. Perifocal edema, contrast enhancement, and calcification were not seen. An abnormally decreased volume of the ipsilateral cerebral hemisphere, the presence of adjacent microgyri, and deep fissures that contained blood vessels were also characteristic findings, indicating abnormal development. Knowledge of this entity is important in differentiating true intracerebral neoplasms.

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