title: Incidence of familial intracranial aneurysms in 200 patients: comparison among Caucasian, African-American, and Hispanic populations.
abstract: OBJECTIVE
  Although the cause of cerebral aneurysms remains unclear, there is clear evidence that genetic predisposition plays a role. Ten percent of patients report an aneurysm in a first-degree family member. However, studies to date have largely involved Caucasian populations. Our goal was to characterize the familial aggregation of intracranial aneurysms in different ethnic groups.
  
  
  METHODS
  We began a prospective, single-center study on patients treated for intracranial aneurysms. Consenting subjects completed a detailed questionnaire regarding the medical history of family members. In families with two or more affected members, asymptomatic first-degree relatives were screened using computed tomographic or magnetic resonance angiography.
  
  
  RESULTS
  In a 2-year period, 292 patients with intracranial aneurysms were treated and 200 were enrolled; these included 124 Caucasians (62%), 34 African-Americans (17%), 38 Hispanics (19%), and 4 Asian-Americans (2%). Forty patients had a family history (20%). The incidence of family history among the different ethnic groups was similar; it was 19.4% in Caucasians, 20.6% in African-Americans, and 21.6% in Hispanics. One Asian-American patient had a family history. Visual inspection of the pedigrees supported autosomal-dominant inheritance with variable penetrance in all ethnic groups.
  
  
  CONCLUSIONS
  This study examined the incidence of familial cerebral aneurysms in three ethnic groups common to the United States: Caucasian, African-American, and Hispanic. We noted an equivalent rate of familial aneurysms, a finding that has immediate clinical implications. In families that have two or more members with cerebral aneurysms, screening of asymptomatic members should be recommended, regardless of ethnic background.
authors.affiliation: Department of Neurosurgery, Brigham and Women's Hospital/Harvard Medical School, Boston, Massachusetts, USA. gkim@sbcglobal.net
authors.forename: Dong H
authors.initials: DH
authors.lastname: Kim
authors.forename: Grace
authors.initials: G
authors.lastname: Van Ginhoven
authors.forename: Dianna M
authors.initials: DM
authors.lastname: Milewicz
mesh_terms: D000328:Adult; D001741:Black or African American / Q000706:statistics & numerical data*; D044383:Black People / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006630:Hispanic or Latino / Q000235:genetics* / Q000706:statistics & numerical data*; D006801:Humans; D015994:Incidence; D002532:Intracranial Aneurysm / Q000453:epidemiology* / Q000208:ethnology / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011446:Prospective Studies; D044465:White People / Q000235:genetics* / Q000706:statistics & numerical data*