After randomization, baseline primary and secondary outcome measure assessments are conducted preoperatively. Within 24 hours of shunting, skull, thoracic, and abdominal X-rays are done to verify device connections and position. Follow-up visits at 1, 3, and 9 months include all primary and secondary outcome assessments. All measurements are done by a research assistant who visits the participating hospitals to prevent inter-observer variation. Study end for each patient is defined as completing the 9 month visit or death, detection of SDE on CT, or shunt removal or revision due to infection or dysfunction.