title: Posterior inferior cerebellar artery with extracranial origin harboring an extracranial aneurysm.
abstract: BACKGROUND
  We report on a rare case of a saccular aneurysm on the TM segment of the right PICA. The aneurysm was located at the nonbifurcation region of the PICA.
  
  
  METHODS
  The patient underwent a brain CT scan that revealed a diffuse SAH and an IVH in the fourth ventricle with obstructive hydrocephalus. After external ventricular drainage to relieve the hydrocephalus, the aneurysm was demonstrated by cerebral digital subtraction angiography.
  
  
  CONCLUSIONS
  The origin of the PICA aneurysm was extracranial and intradural, illustrating a rare location of such type of aneurysm.
authors.affiliation: Department of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital and School of Medicine, National Yang-Ming University, Taipei 112, Taiwan, Republic of China.
authors.forename: Chun-Fu
authors.initials: CF
authors.lastname: Lin
authors.forename: Sanford P C
authors.initials: SP
authors.lastname: Hsu
authors.forename: Ming-Teh
authors.initials: MT
authors.lastname: Chen
authors.forename: Hsin-Hung
authors.initials: HH
authors.lastname: Chen
authors.forename: Yang-Hsin
authors.initials: YH
authors.lastname: Shih
authors.forename: Liang-Shong
authors.initials: LS
authors.lastname: Lee
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Chen
mesh_terms: D000328:Adult; D002531:Cerebellum / Q000098:blood supply*; D002533:Cerebral Angiography; D001270:Cervical Atlas / Q000473:pathology / Q000601:surgery; D005539:Foramen Magnum / Q000473:pathology / Q000601:surgery; D020546:Fourth Ventricle / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D006849:Hydrocephalus / Q000209:etiology / Q000503:physiopathology / Q000601:surgery; D002532:Intracranial Aneurysm / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D008297:Male; D008526:Medulla Oblongata / Q000033:anatomy & histology / Q000098:blood supply; D019635:Neurosurgical Procedures; D013115:Spinal Canal / Q000473:pathology / Q000601:surgery; D013345:Subarachnoid Hemorrhage / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D013346:Subarachnoid Space / Q000473:pathology / Q000503:physiopathology; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014656:Vascular Surgical Procedures; D014711:Vertebral Artery / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000473:pathology*