RT Journal Article SR Electronic T1 Coil migration through two flow-diverting stents JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e256863 DO 10.1136/bcr-2023-256863 VO 17 IS 1 A1 Rogers, Patrick Scott A1 Pickett, Gwynedd A1 Vandorpe, Robert A1 Volders, David YR 2024 UL http://casereports.bmj.com/content/17/1/e256863.abstract AB We report a case of a patient who initially presented with a subarachnoid haemorrhage secondary to a ruptured supraclinoid internal carotid artery (ICA) blister aneurysm. The patient was treated successfully with a flow diverter stent (FD) and coiling; however, a large aneurysm recurrence via a feeding posterior communicating artery (PCOM) was noted on the 1-year follow-up angiogram. During the retreatment, a second FD in the ICA resulted in insufficient aneurysm stasis. Therefore, the decision was made to coil sacrifice the PCOM via posterior circulation access. During the first coil deployment, the distal coil end migrated through the mesh of two overlapping FD into the middle cerebral artery. This complication was a previously unrecognised possibility given the composition of the FD. This case report aims to discuss this process as a potential complication during neurointerventional procedures using these devices.