Hi, I had gone through your question and understand your concerns. First of all arachnoid cyst are not uncommon and they are benign. Over the years different surgical techniques have been applied to remove or drain somehow the cyst and the result were disappointing reapect to the natyral history of these benign lesions. The main reason why are these cysts removed is headache, but there is no evidence that headache is related to the cyst. Furthermore, the headache does not disappear after cyst removal. The recurrence of cyst formation remains high. The only reasonable indication for surgery is cyst dimenaion growth. So basically if your cyst, which probably is an incidental finding, remains the same, do not worry about, and dont think of surgery, because it will not take your headache away. Just have an MRI every two to three years to check the dimension, and avoid head contact activities or sports, because it has been releated with higher incidence of subdural hematomas in pts harboring a arachnoid cyst. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.