title: Epidemiological investigation of 264 sporadic cases of ruptured cerebral aneurysm at a single institution in southwest China.
abstract: BACKGROUND
  The purpose of this study was to investigate the epidemiology of sporadic ruptured cerebral aneurysm in the Chinese population.
  
  
  METHODS
  We retrospectively analyzed the medical records of 264 consecutive Chinese patients admitted to the Affiliated Hospital of Zunyi Medical University of Guizhou Province in Southwest China between December 2012 and March 2015 for spontaneous subarachnoid hemorrhage due to a ruptured cerebral artery aneurysm.
  
  
  RESULTS
  The study population comprised 171 females and 93 males with a median age of 50 (range 5-76) years. The female to male ratio was 1.84:1. For both males and females, aneurysm rupture was most common in the 40-49-year age group (34.5%). Most of the ruptured aneurysms were in the size range of 2-5 mm (47.2%), followed by 5-10 mm (43.8%). Ruptured aneurysms occurred most often in the posterior communicating artery (36.6%) or the anterior communicating artery (25.7%). There were more cases of anterior communicating artery aneurysm on the left side (53 [Left side]/16 [Right side]=3.31, P>0.001) and slightly more cases of posterior communicating artery aneurysm on the right side (54 [Right side]/44[Left side]=1.23, P<0.05).
  
  
  CONCLUSIONS
  This study provides valuable information on the epidemiology of ruptured cerebral aneurysm in the Chinese population.
authors.affiliation: Department of Radiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, People's Republic of China.
authors.forename: Heng
authors.initials: H
authors.lastname: Liu
authors.affiliation: Department of Radiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, People's Republic of China.
authors.forename: Tijiang
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Cerebrovascular Diseases Clinic, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, People's Republic of China.
authors.forename: Song
authors.initials: S
authors.lastname: Jiao
authors.affiliation: Department of Radiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, People's Republic of China.
authors.forename: Bangguo
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of Radiology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou Province, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Guan
authors.affiliation: Department of Imaging and Interventional Radiology, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR, People's Republic of China.
authors.forename: Yi-Xiang J
authors.initials: YX
authors.lastname: Wang
keywords: Chinese population; cerebral aneurysm; epidemiology; rupture; subarachnoid hemorrhage