“…3,6,9,11,12,15,18,23,26,28,42,58,62,68,82 Most prior reports have advocated surgical treatment for arachnoid cyst-associated subdural hygromas. 3,7,8,20,28,29,59,72 We have observed that patients with a symptomatic subdural hygroma associated with an arachnoid cyst will frequently experience complete and lasting spontaneous resolution of their neurological symptoms if managed without surgery. We report our recent experience with managing arachnoid cyst-associated subdural hygromas without surgery and suggest that the often benign natural history of this condition should be considered when making treatment decisions.…”