title: Aneurysm of the A1 Segment of the Anterior Cerebral Artery Associated with the Persistent Primitive Olfactory Artery.
abstract: BACKGROUND
  The persistent primitive artery constitutes the anterior cerebral artery proper. When the persistent primitive artery keeps its embryologic course along the olfactory bulb, it is called the persistent primitive olfactory artery (PPOA).
  
  
  METHODS
  A 69-year-old man presented with an incidentally discovered unruptured aneurysm at the origin of the PPOA. The PPOA originated at the A1 segment of the anterior cerebral artery, coursed anteromedially along the olfactory tract, made a hairpin turn posterosuperior to the midline, and formed the callosomarginal branch of the anterior cerebral artery. The anomalous artery was interpreted as a PPOA (type 3). Type 3 PPOA associated with an unruptured aneurysm is rare.
  
  
  CONCLUSIONS
  There is a high incidence of aneurysms associated with a PPOA. Follow-up studies are necessary in the present case to monitor for the development of another aneurysm at the hairpin bend.
authors: Department of Neurosurgery, Iwate Prefectural Chubu Hospital, Kitakami, Iwate, Japan.
authors: Yuiko
authors: Y
authors: Sato
authors: Department of Neurosurgery, Iwate Prefectural Chubu Hospital, Kitakami, Iwate, Japan. Electronic address: h-kashimura@pref.iwate.jp.
authors: Hiroshi
authors: H
authors: Kashimura
authors: Department of Neurosurgery, Iwate Prefectural Chubu Hospital, Kitakami, Iwate, Japan.
authors: Masaru
authors: M
authors: Takeda
authors: Department of Neurosurgery, Iwate Prefectural Chubu Hospital, Kitakami, Iwate, Japan.
authors: Kohei
authors: K
authors: Chida
authors: Department of Neurosurgery, Iwate Medical University School of Medicine, Morioka, Iwate, Japan.
authors: Yoshitaka
authors: Y
authors: Kubo
authors: Department of Neurosurgery, Iwate Medical University School of Medicine, Morioka, Iwate, Japan.
authors: Kuniaki
authors: K
authors: Ogasawara
mesh_terms: D000368:Aged; D020771:Anterior Cerebral Artery / Q000473:pathology* / Q000601:surgery*; D002533:Cerebral Angiography; D002536:Cerebral Arteries / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D033162:Incidental Findings; D002532:Intracranial Aneurysm / Q000150:complications* / Q000473:pathology* / Q000601:surgery; D018810:Magnetic Resonance Angiography; D008297:Male; D019635:Neurosurgical Procedures / Q000379:methods; D009830:Olfactory Bulb / Q000098:blood supply / Q000473:pathology*; D016896:Treatment Outcome
keywords: Anterior cerebral artery; Olfactory artery; Persistent primitive aneurysm