Table 1.

Classifications of hydrocephalus

Author	Concept	Controversial areas
Raimondi [7]	All intracranial fluids except blood found in excess	Includes vasogenic and cytotoxic edema Includes brain atrophy and hydrocephalus ex vacuo
Mori [4]	Definition of intractable hydrocephalus	In which case is intervention futile?
Johnston [2]	Includes all abnormalities of CSF pressure and volume	Includes arrested hydrocephalus and cysts
Beni-Adani [1]	Obstructive vs communicating forms limited to infants and small children	Classification devised to define babies who may be candidates for third ventriculostomy
Oi [5]	Classification of infantile and fetal hydrocephalus based on CNS developmental state	Prognosis is dependent on what is occurring at the time the pathology develops. May be a rationale for in utero surgery
Rekate [24]	Based on point of obstruction and developed on a mathematical model	Assumes all hydrocephalus is obstructive