The principle of treatment for arachnoid cysts is that no matter which part of the skull an arachnoid cyst is located in, and what the size of the arachnoid cyst is, it does not need to be treated as long as it does not cause space-occupying effects or clinical symptoms. No matter how large the arachnoid cyst is, it is not an indication for surgery. Even small arachnoid cysts require surgery as long as there are occupying effects or clinical symptoms. Arachnoid cysts are congenital developmental anomalies that can be detected in many people during a physical examination. This disease is not a cause for concern as it does not present with clinical symptoms in the majority of people, and surgical intervention is only considered when clinical symptoms are present.