• Terushige Toyooka, Satoru Takeuchi, Naoki Otani, Kosuke Kumagai, Arata Tomiyama, Kojiro Wada, and Kentaro Mori.
• Department of Neurosurgery, National Defense Medical College, Saitama, Japan. Electronic address: terutoy0807@gmail.com.
• World Neurosurg. 2022 Dec 1; 168: 131813-18.

BackgroundAn entrapped temporal horn (ETH) is one of the critical complications after tumor removal in the lateral ventricle trigone that sometimes becomes life threatening.ObjectiveWe sought to develop a novel intraoperative method of prophylactic intraventricular piping (PIP) just after tumor removal to prevent ETH.MethodsThree patients with meningiomas in the lateral ventricle trigone were treated by a novel intraoperative method of PIP just after tumor removal to prevent ETH. Silicone catheters normally used as ventricular drainage catheters were cut to 5- to 6-cm length and inserted into the tumor cavity to ensure communication between the temporal horn and the atrium or the body of the lateral ventricle through the piping straddling the trigone.ResultsNone of our patients developed ETH during the follow-up period without complications caused by the tube placement.ConclusionsPIP might be beneficial to prevent ETH because constant osmotic pressure and constant cerebrospinal fluid pulse wave transmission are maintained between each compartment of the lateral ventricle.Copyright © 2022 Elsevier Inc. All rights reserved.

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