Hi,
Thank you for posting your query.
Arachnoid cyst in the brain can be present since birth in most cases, but it comes to light only when
MRI or CT of the brain is done.
Arachnoid cyst contains fluid (
cerebrospinal fluid) and it is not a
tumor.
Arachnoid cyst most commonly causes headache or
fits. For fits, anti-epileptic medications are required.
In most cases, surgery is not required. Surgery is only required if the arachnoid cyst starts pressing on the normal brain tissues.
So, I agree with your doctor's approach. Repeat MRI would show whether the cyst in enlarging or whether it is pressing on the adjacent brain tissue.
So, at present no need to worry and child need not restrict any activity.
I hope it helps.
Best wishes,
Dr Sudhir Kumar MD DM (Neurology)
Senior consultant Neurologist