What percentage of grade ii arachnoid cysts in the middle cranial fossa are symptomatic?

Arachnoid cysy: The majority of middle cranial fossa arachnoid cysts are present from birth and are incidental findings on the ct or MRI of the brain. These arachnoid cysts are observed unless they become symptomatic due to mass effect on the surrounding brain.

Size: If the cyst is small it's usually not symptomatic and might not need to do any thing, but it in cases grew significantly in size, it might cause symptoms like headache , weakness an general fatigue feeling, in very serious case it might become life threatening ..

See answer: ~66% (2/3) of intracranial arachnoid cysts occur in the middle fossa. Symptoms vary by size and location: small cysts usually have no symptoms and are discovered only incidentally. In one reported study, ~18% of middle cranial fossa cysts presented with progressive symptoms, whereas 44% presented with nonprogressive symptoms and 37% presented with symptoms not associated with the cyst.