Arachnoid cysts are fluid-filled sacs that form on the arachnoid membrane, one of the three layers of tissue that cover the brain and spinal cord. While many individuals with arachnoid cysts ...

A fluid-filled sac that forms between the brain or spinal cord and the arachnoid membrane, one of the protective layers surrounding the central nervous system. Intracranial pressure (ICP): The ...

The arachnoid membrane takes its name from its spider weblike texture. It is one of three layers that protects the brain and spinal cord. Mine had been damaged at some point, creating a cyst that ...