Most arachnoid cysts are congenital lesions and can be treated without specific treatment if there are no obvious clinical symptoms, so some people may not need treatment for the rest of their lives. Arachnoid cysts are benign cystic occupying lesions that result from abnormal division of the arachnoid membrane during development and can be classified as primary or secondary. Some patients may be asymptomatic and are discovered accidentally through imaging studies to diagnose other diseases. However, some patients with arachnoid cysts will have more obvious clinical manifestations, such as headache, nausea, vomiting, seizures, and focal neurological dysfunction due to increased intracranial pressure. Patients with obvious clinical symptoms need to be further examined before a reasonable treatment plan is developed and timely surgical removal is performed. Since most arachnoid cysts can remain the same size and very few can disappear on their own, conservative treatment methods are usually adopted for asymptomatic patients, but regular review is required.