Our expert says:
Not strictly my area, so do also ask your neurologist to discuss this with you in detail. The fact that he is happy and not especially worried, and is sending you for relevant but very different tests is usually a good sign that what he's found is not too serious. Obviously any sensible person would be worried by the news that there is ANYTHING out of the ordinary within one's brain.
As I recall, an arachnoid cyst is a fluid-filled cust on the surface of the brain, usually congenital ( present since birth ) They are often discovered by chance as they often cause no symptoms at all. They may cause quite a variety of symptoms if really large, and these would depend on which part of the brain they'd be pressing on. It seems that some can be safely left alone, others can be drained in a number of ways. His behaviour suggests he doesn't think yours is likely to cause problems.
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