The Johns Hopkins Adult Hydrocephalus Program evaluates approximately 250 new patients per year for hydrocephalus and associated disorders, resulting in the new diagnosis of hydrocephalus in about 100 patients annually. After treatment with either shunt surgery or third ventriculostomy, virtually all patients are followed on a regular basis by physicians in the program (Dr. Michael Williams, neurologist, and Dr. Daniele Rigamonti, neurosurgeon, both involved in this project).