Right temporal arachnoid cysts can be classified as congenital, traumatic, and post-infectious depending on their etiology. Most post-infection cysts are formed due to local adhesions of the arachnoid membrane caused by meningitis, and the cysts are filled with cerebrospinal fluid and are mostly multiple. Arachnoid cysts in the right temporal region usually do not have clinically significant symptoms if they are relatively small. However, if the right temporaliform cyst is relatively large, it may cause headache, nausea, vomiting, seizures, or focal neurological deficits. A subset of patients may present with hydrocephalus, behavioral changes, and may have limb hemiparesis and ataxia. In the case of infants and children, right-sided arachnoid cysts may lead to an enlarged head, irritability, and growth retardation in the child.