fa Neurotrauma Clinical Trial <strong>Background and Importance: </strong>Overdrainage is a complication of ventriculoperitoneal shunt but adjustable valves and anti-siphon devices can prevent it. These very expensive valves are most often inaccessible, so that the majority of the valves available in Togo are fixed differential pressure valves. Although overdrainage is a widely-known issue, we aimed to introduce a new risk factor and the way we manage this complication.<br> <br> <strong>Case Presentation:</strong> This case series study included all patients who had overdrainage or a high potential risk of overdrainage (hydranencephaly). Our technique consisted of partial ligation of the peritoneal catheter at the level of the thorax by non-resorbable wire while controlling the drainage rate at the slots. The goal was to transform this fixed differential pressure valve into a pressure-controlled and flow-regulated one. Patients were followed for 1, 3 and 6 months, postoperatively.&nbsp;&nbsp; &nbsp;<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;<br> <strong>Conclusion:</strong> Hydranencephaly predisposes patients to overdrainage. The partial ligature of the catheter is an effective technique for treating or preventing overdrainage.<br> &nbsp; Overdrainage, Ligation, Catheter 58 62 http://irjns.org/browse.php?a_code=A-10-172-2&slc_lang=fa&sid=1 Essossinam Kpélao * kpelas77@yahoo.fr 10031947532846002238 10031947532846002238 Yes Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Katanga Anthony Békéti 10031947532846002239 10031947532846002239 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Abdel Kader Moumouni 10031947532846002240 10031947532846002240 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Kodjo Mensah Hobli-Ahanogbé 10031947532846002241 10031947532846002241 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Agbéko Komlan Doléagbenou 10031947532846002242 10031947532846002242 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Komi Egu 10031947532846002243 10031947532846002243 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Thierry Alihonou 10031947532846002244 10031947532846002244 No Department of Surgery University Hospital Center of Ouémé and Plateau, Benin Essosolim Hodabalo Bakondé 10031947532846002245 10031947532846002245 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo Pilakimwé Egbohou 10031947532846002246 10031947532846002246 No Intensive Care Unit, Sylvanus Olympio University Hospital, Lomé, Togo Assang Dossim 10031947532846002247 10031947532846002247 No Department of Neurosurgery, Sylvanus Olympio University Hospital, Lomé, Togo