Arachnoid cysts are benign lesions that occur in the central nervous system, most often in the intracranial compartment. They are usually located in the subarachnoid space and contain cerebrospinal fluid. Most arachnoid cysts are located in the middle cranial fossa. Brain involvement with hydatid disease occurs in 1-2% of all Echinococcus granulosus infections and usually presents as an intracranial space occupying lesion, more commonly in children. Surgery is the primary treatment option for hydatid cysts of the brain with low mortality and morbidity. The document discusses several other types of cysts that can occur in the brain.