Arachnoid cyst - parietal

Case contributed by Dr Mostafa Mahmoud El Feky

Presentation

chronic headache

Patient Data

Age: 25
Gender: Female
MRI

Brain MRI

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

Case Discussion

Arachnoid cyst is benign extra-axial cysts that follow 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
Case created: 26th Feb 2016
Last edited: 15th Oct 2016
Inclusion in quiz mode: Included

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