Hi,
Arachnoid cysts are benign lesions. These cysts are filled with cerebrospinal fluid which is present in the brain tissue. These cysts per say donot cause much problem. Occasinally they can cause headache, seizures etc. They are mostly present individually, but can be seen in some cases along with a brain tumor. If you are going to be operated for your tumor, then most probably the cyst will also be removed. They are per say nothing to worry about. For more information read here..
As far as the function of frontal lobe is concerned it is associated with reasoning, planning, parts of speech, movement, emotions, and problem solving.
I would advise you to relax regarding the arachnoid cyst. All the best for your surgery!
Do remember to ACCEPT and consider a BONUS if you found the answer useful. For any clarifications please get back.
Regards
Dr. Gupta

