“…In contrast, because shunt surgery requires permanent implantation of the shunt system, surgical techniques that do not require permanent implantation, such as endoscopic third ventriculography (ETV) and choroid plexus coagulation (CPC), have been developed. Some reports have compared the therapeutic efficacy of these techniques with that of shunting ( 13 – 16 ). Simply stated, ETV is more effective for obstructive hydrocephalus than non-obstructive hydrocephalus, and has a therapeutic effect for obstructive hydrocephalus comparable to shunting.…”