title: Subarachnoid haemorrhage due to a lateral spinal artery aneurysm misdiagnosed as a posterior inferior cerebellar artery aneurysm: case report and literature review.
abstract: METHODS
  A 61 year old man presenting with subarachnoid haemorrhage had a distal posterior inferior cerebellar artery (PICA) aneurysm diagnosed on the initial cerebral angiogram. However, a PICA aneurysm was not found during surgery. A follow-up, super-selective vertebral artery (VA) performed demonstrated a saccular aneurysm located on the lateral spinal artery (LSA). A right sub-occipital craniotomy was performed and the aneurysm arising was identified and obliterated with a small titanium clip.
  
  
  CONCLUSIONS
  We describe the first example of an LSA aneurysm without occlusion or severe stenosis of the VA and PICA. This extremely rare lesion illustrates how knowledge of the angiographic features and super-selective cerebral angiography aids the precise diagnosis and the prevention of surgical complications.
authors.affiliation: Department of Neurosurgery, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan. marivaio@jg7.so-net.ne.jp
authors.forename: Mari
authors.initials: M
authors.lastname: Kurita
authors.forename: Masataka
authors.initials: M
authors.lastname: Endo
authors.forename: Takao
authors.initials: T
authors.lastname: Kitahara
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Fujii
mesh_terms: D002404:Catheterization / Q000592:standards; D002531:Cerebellum / Q000098:blood supply; D002533:Cerebral Angiography / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D003951:Diagnostic Errors / Q000517:prevention & control*; D006801:Humans; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008526:Medulla Oblongata / Q000098:blood supply; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000295:instrumentation / Q000379:methods; D011237:Predictive Value of Tests; D012086:Reoperation; D013345:Subarachnoid Hemorrhage / Q000209:etiology*; D013525:Surgical Instruments; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014711:Vertebral Artery / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000473:pathology; D020217:Vertebral Artery Dissection / Q000000981:diagnostic imaging* / Q000473:pathology