“…12,54,74,76,78,88,94 However, there are no studies evaluating a large series of adults with untreated arachnoid cysts who have undergone clinical and imaging followup. Although arachnoid cysts may be treated surgically by endoscopic fenestration, 24,31,48,67,79,91,105 craniotomy for fenestration, 15,31,55,79 or shunt placement, 15,34,67,73,79 these operations are associated with potential morbidity. 24,39,48,55,57,58,79,80,85,105 A better understanding of the prevalence and natural history of these cysts in adults may lead to better definition of surgical indications for adult patients with arachnoid cysts discovered on imaging.…”