AVM Clinical characteristics and surgical results of patients with cerebral arteriovenous malformations Jizong Zhao, MD (Professor, Chairman) * , Shuo Wang, MD, Jingsheng Li, MD, Wei Qi, MD, Dali Sui, MD, Yuanli Zhao, MD Department of Neurosurgery, Beijing Tiantan Hospital, Capital University of Medical Sciences, Beijing 100050, China Received 7 July 2003; accepted 27 April 2004 Abstract Background: Cerebral arteriovenous malformation (AVM) is a common vascular disease in neurosurgery, and the indication for alternative treatments remains controversial. In a review of a series of 2086 patients with AVMs, the clinical characteristics and surgical results were assessed. Methods: Collected data of 2086 consecutive patients with AVMs from January 1956 to October 2001 were analyzed. All patients were divided into 2 groups: traditional surgery group (from 1956 to 1991) and microsurgery group (from 1992 to 2001). The variables assessed for clinical characteristics in our study included age (at presentation), sex, Spetzler-Martin grade, and first presentations. Surgical complications were assessed between different surgery groups by v 2 test. Results: Cerebral AVMs are more commonly diagnosed at age of 20 to 40 years, which comprises almost one half of the whole population. The size of the AVMs ranged from 1 to 9 cm. There were 77 cases of giant AVMs in this series that were treated by a combination of surgical resection and intraoperative embolization. Hemorrhage (43.4%), headache (24.9%), and seizure (17.3%) were the first 3 common presentations. Regarding Spetzler-Martin grading system, the percentage of grade 3 to 5 patients increased, whereas that of grade 1 patients decreased in the microsurgery group ( P = .00). However, compared with the traditional surgery group, the incidence of main surgical complications (death, hemiparalysis, cranial nerve dysfunction, and gastrointestinal hemorrhage) decreased significantly in the microsurgery group ( P = .00). Although the incidence of main surgical complications had no statistical difference between early (from 1992 to 1996) and late microsurgery subgroup (from 1997 to 2001) ( P = .796), the incidence really decreased with increase of higher- grading patients (grade 3-5) in the late microsurgery group ( P = .00). Conclusions: Cerebral AVM is one of the important reasons for spontaneous intracranial hemorrhage in patients younger than 40. Spetzler-Martin grading system is helpful to predict the surgical risk. Microsurgical technique has made surgical treatment safer and become the best choice for patients with cerebral AVM. D 2005 Elsevier Inc. All rights reserved. Keywords: Cerebral arteriovenous malformations; Clinical characteristics; Surgical risk; Giant 1. Introduction Cerebral arteriovenous malformation (AVM) is a com- mon vascular disease in neurosurgery. The presence of an AVM confers the risk of death or permanent neurologic deficit to the patient [2,12,19,21]. Surgery resection is traditionally the first choice because it can eliminate the risk of hemorrhage immediately. Advances in interventional neuroradiology and stereotactic radiosurgery offer alterna- tives to microsurgery [16,17,20]. Yet the indication of alternative treatments has still been controversial. Thera- peutic decisions for AVMs are based on the natural course and the results or risks of the given treatment, both of which have still not been clearly defined. We analyzed the data of 2086 patients with AVMs to make a further study on AVM clinical characteristics and surgical risks. 0090-3019/$ – see front matter D 2005 Elsevier Inc. All rights reserved. doi:10.1016/j.surneu.2004.04.021 * Corresponding author. Tel.: +86 10 6511 3440; fax: +86 10 6511 3440. E-mail address: zhaojz@public.bta.net.cn (J. Zhao). Surgical Neurology 63 (2005) 156 – 161 www.surgicalneurology-online.com