Arachnoid cysts in the occipital pool do not cause clinical symptoms if the cysts are not large, and generally do not require treatment, and regular review is sufficient; if the cysts are large, or the corresponding symptoms appear, then surgical treatment is required. Arachnoid cyst of the occipital pool is an arachnoid cyst that occurs in the medullary pool of the cerebellum in the posterior cranial fossa. If the cyst is not large, and the patient does not have symptoms throughout life, and it is only discovered by chance during a physical examination, this case does not require treatment, and regular review is all that is needed. If the cyst increases in size and exerts pressure on the cerebellum, or causes obstructive hydrocephalus, resulting in a series of symptoms of increased intracranial pressure such as headache, nausea, vomiting, blurred vision, etc., then it may result in cerebral herniation, which is life-threatening, and this condition requires treatment, which can be performed by surgically removing the cyst and relieving the compression. If you are diagnosed with occipital arachnoid cyst, please follow the doctor’s instructions for review and treatment.