<unk> s are cerebrospinal fluid-filled sacs that are located between the brain or spinal cord and the<unk>  membrane, one of the three membranes that cover the brain and spinal cord.
Arachnoid cyst
Subdural hygroma
Choroid plexus papilloma
Choroidal fissure cyst
Acoustic neuroma
Craniopharyngioma
Meningioma
Cavernous sinus thrombosis