What is an arachnoid cyst?

Arachnoid cysts are the most common type of brain cyst. They are often congenital, or present at birth (primary arachnoid cysts). The cysts are fluid-filled sacs, not tumors. The likely cause is a split of the arachnoid membrane, one of the three layers of tissue that surround and protect the brain and spinal cord.Click to see full answer. Keeping this in consideration, is an arachnoid cyst dangerous?Untreated, arachnoid cysts may cause permanent severe neurological damage when progressive expansion of the cyst(s) or bleeding into the cyst injures the brain or spinal cord. Symptoms usually resolve or improve with treatment.One may also ask, do arachnoid cysts go away? After rupture, subdural effusion must develop around the cyst. As this effusion is absorbed, the fluid in the cyst drains away, after which the cyst becomes smaller and gradually disappears. This supports the possibility of a “natural cure” for arachnoid cysts without surgical intervention. Also Know, what is the treatment for arachnoid cyst? There are three surgical options for treating an arachnoid cyst: A pediatric neurosurgeon may place a permanent drainage system, a type of shunt, to drain fluid from the cyst and reduce pressure on the brain. A permanent shunt drains fluid from the cyst into the abdomen, where it is reabsorbed harmlessly into the body.Can an arachnoid cyst turn into cancer?Brain cysts are fluid-filled sacs that may form in the brain. They can be benign (not cancer) or malignant (cancer). These include arachnoid, colloid, dermoid, epidermoid, pineal, infectious, and tumor cysts. Even when brain cysts are noncancerous, they may press against brain tissue and cause symptoms.