Possible causes of right hippocampal cysts include congenital malformations of embryonic development, craniocerebral injury, and intracranial inflammation. Hippocampal cysts are arachnoid cysts, which are essentially a type of clear, colorless fluid surrounded by a transparent, thin membrane. The etiology of the disease is complex, and it is currently believed that its causes are divided into primary and secondary. Primary arachnoid cysts are caused by congenital malformations of embryonic development or ectopic development of tissues. Secondary cysts are mainly caused by craniocerebral injury, intracranial inflammation, intracranial hematoma, or after brain surgery. Hippocampal cysts may have no obvious clinical manifestations, or may manifest as headache, seizures, megalencephaly, mental retardation, vomiting and other symptoms. Its treatment is mainly based on symptomatic drug control, and antiepileptic drugs can be chosen if epilepsy is present. If refractory epilepsy is present, it can be treated surgically with accurate localization. The appearance of hippocampal cysts or the above symptoms, timely consultation. Antiepileptic drugs need to be used under the supervision of a physician.