In one case, the cause of death was thrombosis of both posterior cerebral arteries (treated large basilar tip aneurysm) 30 days after coiling of the aneurysm. In the other patient, death occurred 27 days after ictus due to neurosurgical and medical complications. The 30-day case fatality rate among all aSAH patients treated in the same period was 17.8% (n¼56, including 19 patients who were never transferred to NIW and therefore excluded in the present study).