Brain cysts are mainly classified as arachnoid cysts and ventricular meningeal cysts. Arachnoid cysts, also known as soft meningeal cysts, are congenital intracranial disorders that form when cerebrospinal fluid-like cystic fluid is enclosed within cystic structures formed by the arachnoid membrane. Ventricular meningeal cysts, on the other hand, are rare and originate from ectopic ventricular meninges during embryonic life. Arachnoid cysts are most commonly found in the middle skull base, pontocerebellar horn, suprasellar and posterior cranial fossa. They are usually found occasionally. Most arachnoid cysts are asymptomatic, and those that are symptomatic tend to present in childhood. Symptoms vary by location and tend to be relatively mild. Cysts in the middle cranial fossa can present with convulsions, headaches, and mild hemiparesis; suprasellar cysts with hydrocephalus can present with increased intracranial pressure, headaches, nausea and vomiting, and optic papilloedema. And it will lead to cranial cavity enlargement, visual impairment, precocious puberty, etc.; when diffuse upper and lower canopy cyst with hydrocephalus, it will also show symptoms of increased intracranial pressure, cranial cavity enlargement, growth retardation and other symptoms. Regular CT or MRI examinations can then be used to evaluate changes in arachnoid cysts. Ventricular meningeal cysts, which can produce clinical manifestations such as epilepsy, mild hemiparesis, and increased intracranial pressure, can be diagnosed by CT or MRI. Currently, most physicians do not consider treatment necessary for arachnoid cysts without occupying effects or symptoms, regardless of cyst site and size. Instead, ventricular meningeal cysts can be treated by surgical resection, cystic ventriculostomy, or abdominal shunt surgery.