Arachnoid cyst - parietal

Case contributed by Dr Mostafa El-Feky

Presentation

Chronic headache.

Patient Data

Age: 25 years
Gender: Female
MRI

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, no midline shift. No associated edema at the related brain parenchyma. 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 size.

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Case information

rID: 43179
Published: 28th Feb 2016
Last edited: 22nd Mar 2019
Inclusion in quiz mode: Included

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