Arachnoid cyst - parietal

Case contributed by Dr Mostafa El-Feky


Chronic headache.

Patient Data

Age: 25 years
Gender: Female

Brain MRI

A well defined extra-axial spindle-shaped right frontoparietal cystic lesion is noted measuring 4 x 2 cm. It showed a thin wall and clear watery content. It follows CSF in all pulse sequences including free diffusion. It exerts a mild mass effect in the form of compression upon the underlying brain parenchyma but no midline shift. No associated cerebral edema. It is splaying the overlying inner table of the skull. 

Case Discussion

Arachnoid cyst is a benign extra-axial cyst that follows CSF in all pulse sequences including FLAIR and DWI. It implies mild mass effect as compression on the surrounding structures. It can remodel the overlying bone over time and if large in size.

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Case information

rID: 43179
Published: 28th Feb 2016
Last edited: 30th Nov 2019
Inclusion in quiz mode: Included

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