Chronic subdural collection after endoscopic third ventriculostomy

Endoscopic third ventriculostomy (ETV) is considered a safe technique for the treatment of obstructive hydrocephalus. We describe a case of chronic subdural haematoma (CSDH) after ETV, revealed by MRI four weeks after the procedure, and requiring surgical evacuation, in a 69 y.o. asymptomatic male patient. In our opinion, overdrainage may evolve also in endoscopic treatment of obstructive hydrocephalus. This complication could be the starting point of the subdural collection. We review the literature and discuss the causes that may lead to CSDH after ETV procedure.