• Kevin Z Zhou, Julian Maingard, Hong Kuan Kok, Judy Wang, Christen D Barras, Alan O'hare, Seamus Looby, Paul Brennan, John Thornton, Ronil V Chandra, Duncan Mark Brooks, and Hamed Asadi.
• Interventional Neuroradiology Unit, Monash Imaging, Monash Health, Melbourne, Australia. Electronic address: kevin.zy.zhou@gmail.com.
• World Neurosurg. 2019 Mar 1; 123: e661-e669.

PurposeEndovascular treatment of neurovascular disorders is now well established as effective and safe; however, the nature of the intracranial vasculature poses unique challenges. The unintentional dislodgement or fracture of a device and its migration within cerebral vessels is a complication with serious potential morbidity that must be managed urgently. In this series, the authors describe 7 cases of a stentriever being used to remove foreign objects from within the cerebral vasculature.MethodsA retrospective search of all interventional neurovascular procedures performed in 2017 at a tertiary metropolitan hospital was performed to identify cases of dislodged devices.ResultsFive dislodged endovascular coils, 1 microcatheter, and 1 fractured stentriever were technically successfully retrieved. In 6 of the cases, the foreign object was successfully removed with a stentriever alone, whereas 1 case used a J-tip wire and a "J-tip flick" to manipulate the coil and facilitate retrieval. Stentrievers, particularly when used alone, confer the advantages of speed, cost, as well as being tailor-made for cerebral vessels. They also allow continuous blood flow when deployed, a critical advantage when considering cerebral perfusion. Critical techniques include the gradual deployment of the stentriever alongside the foreign object to allow its entanglement and partial resheathing, so that the foreign object can become pinned within the microcatheter. Stentrievers do remain limited by vessel caliber and are less able to entangle larger, stiffer devices.ConclusionThe migration of foreign devices during neurointerventional procedures is a serious complication requiring urgent treatment. This case series highlights the efficacy and advantages of using a stentriever and suggests its consideration as a first-line technique in recovering dislodged foreign bodies in the cerebral vasculature.Copyright © 2018 Elsevier Inc. All rights reserved.

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