Springer Acta Medica Okayama 00016268 159 7 2017 De novo vertebral artery dissecting aneurysm after internal trapping of the contralateral vertebral artery 1329 1333 EN Naoya Kidani Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Kenji Sugiu Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Tomohito Hishikawa Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Masafumi Hiramatsu Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Jun Haruma Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Shingo Nishihiro Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Yu Takahashi Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Isao Date Department of Neurological Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences We present the case of a de novo vertebral artery dissecting aneurysm (VADA) after endovascular trapping of a ruptured VADA on the contralateral side. The first ruptured VADA involved the posterior inferior cerebellar artery, which was successfully treated by endovascular internal trapping using a stent. A follow-up study at 3 months revealed a de novo VADA on the contralateral side. The second VADA was successfully embolized using coils while normal arterial flow in the vertebral artery was preserved using a stent. Increased hemodynamic stress may cause the development of a de novo VADA on the contralateral side. No potential conflict of interest relevant to this article was reported.

Springer Nature Acta Medica Okayama 00016268 161 8 2019 A comparison of the prevalence and risk factors of complications in intracranial tumor embolization between the Japanese Registry of NeuroEndovascular Therapy 2 (JR-NET2) and JR-NET3 1675 1682 EN Tomohito Hishikawa Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Kenji Sugiu Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Satoshi Murai Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Yu Takahashi Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Naoya Kidani Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Shingo Nishihiro Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Masafumi Hiramatsu Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Isao Date Department of Neurological SurgeryOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Tetsu Satow Department of NeurosurgeryNational Cerebral and Cardiovascular Center Koji Iihara Department of Neurosurgery Graduated School of Medical SciencesKyusyu University Nobuyuki Sakai Department of NeurosurgeryKobe City Medical Center General Hospital JR-NET2 and JR-NET3 study groups. BACKGROUND: The Japanese Registry of NeuroEndovascular Therapy 2 (JR-NET2) and 3 (JR-NET3) were nationwide surveys that evaluated clinical outcomes after neuroendovascular therapy in Japan. The aim of this study was to compare the prevalence and risk factors of complications of intracranial tumor embolization between JR-NET2 and JR-NET3. METHODS: A total of 1018 and 1545 consecutive patients with intracranial tumors treated with embolization were enrolled in JR-NET2 and JR-NET3, respectively. The prevalence of complications in intracranial tumor embolization and related risk factors were compared between JR-NET2 and JR-NET3. RESULTS: The prevalence of complications in JR-NET3 (3.69%) was significantly higher than that in JR-NET2 (1.48%) (p = 0.002). The multivariate analysis in JR-NET2 showed that embolization for tumors other than meningioma was the only significant risk factor for complication (odds ratio [OR], 3.88; 95% confidence interval [CI], 1.13-12.10; p = 0.032), and that in JR-NET3 revealed that embolization for feeders other than external carotid artery (ECA) (OR, 3.56; 95% CI, 2.03-6.25; p < 0.001) and use of liquid materials (OR, 2.65; 95% CI, 1.50-4.68; p < 0.001) were significant risks for complications. The frequency of embolization for feeders other than ECA in JR-NET3 (15.3%) was significantly higher than that in JR-NET2 (9.2%) (p < 0.001). Also, there was a significant difference in the frequency of use of liquid materials between JR-NET2 (21.2%) and JR-NET3 (41.2%) (p < 0.001). CONCLUSIONS: Embolization for feeders other than ECA and use of liquid materials could increase the complication rate in intracranial tumor embolization. No potential conflict of interest relevant to this article was reported.