Arachnoid cystic syndrome (ACS), also known as arachnoiditis cystica, is a rare brain disorder in which fluid-filled cysts or cavities form in the arachnoid membrane of the brain. Cysts typically range in size from a few millimeters to several centimeters and can be located either inside or outside the brain. Sometimes cysts are so small that they can only be detected with magnetic resonance imaging (MRI).
Typical signs and symptoms of ACS include headaches, dizziness, nausea, vomiting and blurred vision. Other symptoms may include fatigue, depression, insomnia and mood swings.
Treatment for ACS includes drug therapy and surgery. Drug treatment may help reduce the frequency and severity of symptoms, while surgery may be required to remove large cyst masses. In some cases, a combination of both treatments may be used.
In general, arachnoid cystic formations represent a very serious problem for the patient and require timely diagnosis and treatment.