Bilateral temporal arachnoid cysts
A 1 year old child. ? delayed milestones.
Non Contrast CT brain
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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.
2 case question available
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.