i) Communicating and obstructive hydrocephalus
ii) Arachnoid cyst
iii) Colloid cyst
iv) Rathke cleft cyst
v) Neuroepithelial cyst
vi) Disorders of CSF hydrodynamics
(1) Increased intracranial pressure from hydrocephalus and shunt malfunction
(2) Intracranial hypotension
(3) Complications of CSF diversion procedures