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A member asked:
What does left middle cranial fossa arachnoid cyst mean?
A doctor has provided 1 answer
Likely congenital: Typically found coincidentally when images obtained for very different purpose. Almost always present from birth, but on rare occasions can expand, but usually without mass effect. May be of value periodically to repeat scans to ascertain absence of issues.
Answered 10/31/2018
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