Presentation
A 1 year old child. ? delayed milestones.
Patient Data
Age: 1 year
Gender: Male
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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.
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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