- CT: Porencephalic cysts appear as an intracranial cyst which has a well defined border and central attenuation the same as CSF. There is usually no mass effect on the adjacent parenchyma, although occasionally the cysts are enlarging and do result in local mass effect. There is no enhancement with contrast, and no solid component.
- MRI: As with CT, appears well defined and often corresponds to a vascular territory. The cyst is lined by white matter, which may or may not demonstrate evidence of gliosis (this depends on the age at which the insult occurred). Importantly the cyst is not lined by grey matter, helpful in distinguishing them from arachnoid cysts and schizencephaly. Typically the cyst seen to communicate with the ventricles and/or the subarachnoid space.
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