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Arachnoid cyst

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20 year old gentleman came to the ER following a motor vehicle accident. Routine CT brain was asked for to rule out any internal injury.

CT

Findings

MRI

Coronal T2

Findings

Key points

Most common site of origin of the arachnoid cyst is in the middle cranial fossa, splaying the Sylvian fissure. Depending on the size and extent, it is classified by the Galassi classification. This a type III variant.

They tend to be asymptomatic and pounced upon incidentally. The larger ones may cause symptoms secondary to mass effect.

 

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