Symptoms of occipital large pool arachnoid cysts are mainly due to the occupying effect of occipital large pool arachnoid cysts, resulting in compression of the surrounding tissues and cerebrospinal fluid circulation pathway and the corresponding symptoms. The main symptoms include: 1) increased intracranial pressure, when the cyst is very large, the patient may have headache, nausea, vomiting and drowsiness, etc. 2) epilepsy, if the cyst ruptures, epilepsy may occur. 3) may cause brainstem dysfunction or hydrocephalus, mainly due to the occipital arachnoid cysts compression of the brainstem or cerebrospinal fluid circulatory pathway caused by the compression of the occipital pool arachnoid cysts. For symptomatic occipital pool arachnoid cysts, surgical treatment is usually needed, and there are many kinds of surgical methods, such as drilling and needle suction and drainage, drilling and endoscopic penetration of the cyst, and peritoneal or venous shunting of the cyst.