Arachnoid Cysts | Symptoms & Causes

What causes arachnoid cysts?

Doctors aren’t sure exactly what causes arachnoid cysts, but they think the cysts may form if there is a tear in the arachnoid membrane that surrounds the brain and spinal cord. Boys are four times more likely to have arachnoid cysts than girls.

What are the symptoms of an arachnoid cyst?

Some children with arachnoid cysts will never have symptoms. Most people who will have symptoms usually have them before age 20, though symptoms often start before age 1.

Arachnoid cysts can cause a large range of symptoms, depending on where the cysts are located and their size. Some common symptoms include: 

  • headaches
  • nausea and vomiting
  • seizures
  • hearing and vision problems
  • dizziness
  • trouble with balance and walking
  • leg or back pain
  • numbness or tingling in the arms or legs