Subarachnoid cysts usually do not have a clear manifestation, the main manifestation of severe cases is a severe headache with positive meningeal irritation signs, and usually there is no limb movement disorder. Subarachnoid cysts are often caused by trauma and inflammation. It is also prone to cause other diseases such as retinitis, cranial defect, cerebral subarachnoid hemorrhage, secondary adhesive arachnoiditis, cranial tuberculosis, and subarachnoid hemorrhage in the elderly. Symptoms such as high fever and coma, protruding eyes, brainstem hemorrhage, cysts, arachnoid adhesions, arachnoid thickening, arachnoid cysts in the arachnoid space, and impaired consciousness can also occur.