Intracranial arachnoid cysts are relatively common, and a significant proportion of cases have no clinical manifestations and are discovered accidentally during physical examination. Arachnoid cysts can occur in a variety of intracranial locations, the common ones are as follows: 1, hyaline septal cyst; 2, arachnoid cyst in the tegmental pool; 3, arachnoid cyst in the right temporal pool; 4, arachnoid cyst in the superior saddle pool; 5, arachnoid cyst in the superior cerebellar pool; 6, arachnoid cyst in the left pontocerebellar horn. Smaller arachnoid cysts do not require special treatment, as long as the changes in the cyst are regularly reviewed and observed; if the cyst has a tendency to increase in size or to cause neurological symptoms by compressing the surrounding brain tissue, surgery is required. Surgery can be chosen from cyst-abdominal shunt, but it is prone to complications such as shunt obstruction and infection. Endoscopic minimally invasive surgery with cyst-pool fistula is also available, the latter with less damage and faster recovery.