Bilateral temporal arachnoid cysts

Case contributed by Dr Abdel-Rahman Abdel-Halim


A 1 year old child. ? delayed milestones.

Patient Data

Age: 1 year
Gender: Male

Non Contrast CT brain

Non-contrast  CT brain scan revealed extra-axial cystic lesions seen in both middle cranial fossae, the largest one is at the left side and it measures 3.5 x 3 cm in its maximum transverse diameters.

Both temporal lobes appear hypoplastic and displaced posteriorly. 

Prominent subarachnoid spaces are noted.

Case Discussion

True arachnoid cysts are the most common congenital cystic lesions in the brain, accounting for approximately 1% of intracranial mass lesions. These cysts are related to the arachnoid membranes. The most common site is the middle cranial fossa. Clinically, most are asymptomatic but may cause hydrocephalus.

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Case information

rID: 26406
Published: 20th Dec 2013
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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