title: [Endovascular treatment of a rare type of aortic arch aneurysm derived from the fourth aortic arch].
abstract: OBJECTIVE
  To report a rare type of aortic arch aneurysm.
  
  
  METHODS
  Three cases of aortic arch aneurysm derived from the fourth aortic arch were retrospectively analyzed. The pathogenesis and treatment of this type of aortic arch aneurysm were investigated.
  
  
  RESULTS
  Most of the aneurysm body was located in the Z2 zone, which was the stem from the fourth aortic arch in the embryonic development period. All of the 3 cases could not be explained by common etiology. We speculated that the cause might be developmental anomaly of the fourth aortic arch. All the 3 aortic arch aneurysms were totally excluded with a covered stent. The technical success rate was 100%. Endoleak of type I was seen in one case, which was resolved in a later open surgery. During the follow-up, no type of complications was found.
  
  
  CONCLUSIONS
  To the best of our knowledge, this is the first report of this type of aortic arch aneurysm. The cause may be developmental anomaly of the fourth aortic arch. Endovascular treatment of this type of aortic arch aneurysm is feasible.
authors.affiliation: Department of Vascular Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Xue-min
authors.initials: XM
authors.lastname: Zhang
authors.affiliation: Department of Vascular Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Zhan-guo
authors.initials: ZG
authors.lastname: Sun
authors.affiliation: Department of Cardiac Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China.
authors.forename: Bao-shi
authors.initials: BS
authors.lastname: Zheng
authors.affiliation: Department of Cardiology, First Affiliated Hospital of Guangxi Medical University, Nanning 530021, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Huang
authors.affiliation: Department of Vascular Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Zhang
authors.affiliation: Department of Vascular Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Jing-jun
authors.initials: JJ
authors.lastname: Jiang
authors.affiliation: Department of Vascular Surgery, Peking University People's Hospital, Beijing 100044, China.
authors.forename: Chang-shun
authors.initials: CS
authors.lastname: He
mesh_terms: D017545:Aortic Aneurysm, Thoracic; D019917:Blood Vessel Prosthesis Implantation; D006801:Humans; D012189:Retrospective Studies; D015607:Stents; D016896:Treatment Outcome