No abstract

patients, 15%). Distribution of telescoping type was as follows: 21 aneurysms (44%) were treated with proximal extension, 13 aneurysms (27%) with distal extension and 14 aneurysms (29%) with FD placement inside one another. Thirty patients (70%) had complete aneurysm occlusion at follow-up. Two patients (4%) had to be retreated. Four patients (9%) had a permanent intraprocedural complication. Conclusion We present a multi-institutional case series that focuses on the technical nuances and challenges of telescoping pipelines for the treatment of intracranial aneurysms. These data indicate a higher-than-expected complication rate that is likely due to the technical complexity of these cases. We hope these cases further educates the reader on the indications and challenging aspects of telescoping pipeline devices.