"Like arachnoid cysts elsewhere, they may be asymptomatic and discovered incidentally. When a cyst becomes symptomatic, the patient may present with headache, signs and symptoms of obstructive hydrocephalus, focal neurology or seizures 2."
"Intraventricular arachnoid cysts are non-neoplastic, benign and usually asymptomatic. If large and/or thought to be symptomatic, these cysts can be fenestrated endoscopically 3,4."