title: Ruptured de novo posterior communicating artery aneurysm associated with arteriosclerotic stenosis of the internal carotid artery at the supraclinoid portion.
abstract: BACKGROUND
  Several de novo intracranial aneurysms have been described related to changes in hemodynamics after therapeutic occlusion of internal carotid artery (ICA); however, de novo aneurysms related to a supraclinoid arteriosclerotic stenosis of the ICA have not been described yet. Authors consider that it is important to bear in mind the possibility of developing an aneurysm in these special conditions.
  
  
  METHODS
  The evolution of a 62-year-old patient with subarachnoid hemorrhage, intraparenchymal frontal hematoma with some atypical circumstances that were presented together as well as the treatment he received are shown in this report. We can see this patient suffered a right thalamic hemorrhage at the age of 51 years; this condition was associated to a severe atherosclerotic stenosis of right supraclinoid ICAy. A long term had elapsed since the diagnosis of the stenosis and the discovery of a ruptured ipsilateral de novo supraclinoid internal carotid artery-posterior communicating artery (ICA-PcomA) aneurysm.
  
  
  CONCLUSIONS
  IT SEEMS LIKE BOTH CONDITIONS: the atherosclerotic supraclinoid ICA which tells of an Samano et at: Ruptured De Novo PcomA Aneurysm Associated with Arteriosclerotic Stenosis of Supraclinoid ICA. Altered vessel environment coupled to a long exposure time, hemodynamic changes, unbalance in the wall sheer stress could all of them lead to the development of the de novo aneurysm.
authors.affiliation: Department of Surgical Neurology, Research Institute for Brain and Blood Vessels Akita, Akita City, Japan.
authors.forename: Abenamar
authors.initials: A
authors.lastname: Sámano
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ishikawa
authors.forename: Junta
authors.initials: J
authors.lastname: Moroi
authors.forename: Shingo
authors.initials: S
authors.lastname: Yamashita
authors.forename: Akifumi
authors.initials: A
authors.lastname: Suzuki
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Yasui