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Hi sridhaaran,

Most arachnoid cysts are asymptomatic and do not require treatment. Treatment may be necessary when symptomatic and then possibly require surgery. If you would like more peace of mind, you can always consult with a second neurologist and get another opinion. 

Here is some more information on arachnoid cysts: http://www.ninds.nih.gov/disorders/arachnoid_cysts/arachnoid_cysts.htm

All the best to you and your son,

Rosa