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Article History

Received: 29 March 2018

Accepted: 12 June 2018

First Online: 19 July 2018

Compliance with ethical guidelines

:

: D. Behme Consultant: Phenox; speakers fees: Siemens, Styker, Penumbra. M. Wiesmann worked as a consultant and received reimbursement for lectures or travel support: Stryker Neurovascular; received reimbursement for lectures or travel support: Bracco Imaging, Medtronic, Siemens Healthcare, Abbott. A. Mpotsaris consultancy (modest fees): Neuravi, Penumbra, Sequent Medical. M.-N. Psychogios: travel grant, fees: Styker, Phenox, Penumbra, Acandis, Siemens. V. Maus, S. Henkel, A. Riabikin, C. Riedel, I. Tsogkas, A.C. Hesse, N. Abdullayev and O. Jansen declare that they have no competing interests.

: According to the guidelines of the respective local ethics committees, ethical approval was given when necessary (University Medical Center Göttingen) for this anonymous retrospective study, which was conducted in accordance to the Declaration of Helsinki. A patient’s consent for treatment was obtained according to the individual institutional guidelines. Due to the retrospective nature of the study additional informed consent was deemed unnecessary.