Long standing epilepsy.
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A moderate size cyst in the right parieto-occipito-temporal junction measuring 5 x 4 x 6 cm has a small communication with the occipital horn of the right lateral ventricle. It follows CSF signal in all sequences, with no diffusion restriction or enhancement. It is not lined by a grey matter and is associated with a small amount of adjacent FLAIR hyperintensity. It exerts mild mass effect on the adjacent parenchyma with slight remodelling of the overlying calvarium noted.
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The occipital horn has features most in keeping with a porencephalic cyst. The absence of grey matter lining the defect helps distinguish it from open lipped schizencephaly.
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