title: Intracranial aneurysms in identical twins.
abstract: BACKGROUND
  Though familial intracranial aneurysms are well documented, only a few cases of intracranial aneurysms in identical twins have been reported.
  
  
  METHODS
  Our patient, a 46-year-old woman, presented with a subarachnoid hemorrhage (SAH) due to a ruptured aneurysm. At the age of 36, her identical twin sister had also suffered SAH from a ruptured aneurysm. Both twins were treated successfully.
  
  
  CONCLUSIONS
  The likelihood of the occurrence of an aneurysm may be higher for a twin whose identical twin has developed an aneurysm than for the general population. Therefore, it is reasonable to perform certain screening procedures for aneurysms on an asymptomatic twin when the other presents with SAH due to a ruptured aneurysm.
authors.affiliation: Department of Neurosurgery, Osaka City General Hospital, Miyakojima, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nakajima
authors.forename: H
authors.initials: H
authors.lastname: Kishi
authors.forename: T
authors.initials: T
authors.lastname: Yasui
authors.forename: M
authors.initials: M
authors.lastname: Komiyama
authors.forename: Y
authors.initials: Y
authors.lastname: Iwai
authors.forename: K
authors.initials: K
authors.lastname: Yamanaka
authors.forename: M
authors.initials: M
authors.lastname: Nishikawa
mesh_terms: D004200:Diseases in Twins; D005260:Female; D006801:Humans; D002532:Intracranial Aneurysm / Q000150:complications / Q000000981:diagnostic imaging; D008875:Middle Aged; D011859:Radiography; D013345:Subarachnoid Hemorrhage / Q000209:etiology / Q000517:prevention & control; D014430:Twins, Monozygotic