For patients in the guided group, catheter placement is performed in the operating theatre during anesthesia under routine sterile conditions and antibiotic prophylaxis. The phone-assisted technique used for guided placing of a ventricular catheter through an burr hole has been previously described in detail. The only difference is the use of a easy-to-use portable mini-tablet available for all neurosurgeons instead of a phone. In brief, the patient is positioned and draped in typical sterile fashion for ventriculostomy (if necessary enlarged for shunt placement). Using a standard adult perforator (14 mm; AESCULAP, Germany), a frontal burr hole is made.