In this retrospective, multicentre study, we investigated the interventional treatment of five patients with giant aneurysms of the posterior circulation by using Accero®-Rex-Stents between 11/2022 – 08/2023. The patients were treated at three specialized tertiary hospitals with a neurointerventional unit and expertise in aneurysm treatment.We report on the preinterventional diagnosis and clinical state of the patients including clinical and baseline imaging characteristics as well as technical aspects of the interventional procedures with emphasis on the used material and the feasibility of the procedures in all patients (Table 1).

The Accero®-Rex-Stents are intended for use with embolization materials in the treatment of intracranial aneurysms. They consist of a Nitinol composite wire with a platinum core and a central X-ray marker in the stent mesh. Compared to the established standard Accero®-Stents with length between 10 – 25 mm and a diameter between 2.5 – 4 mm, they have a higher amount of platinum in the wire core. Despite its size with a length of 30 – 60 mm and a diameter of 7 – 10 mm it possesses the same resheathability. It is intended for the use in vessels with diameters between 5.5 – 10 mm and can be delivered via 0.039’’ NeuroSlider 39® microcatheter (Acandis, Pforzheim, Germany) delivery catheters (see Figure 4).