Porencephalic cyst

Case contributed by Assoc Prof Frank Gaillard


Long standing epilepsy.

Patient Data

Age: 25 years
Gender: Male

MRI brain


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 remodeling of the overlying calvarium noted.  

Case Discussion

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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