title: Pseudoaneurysm at the Distal Posterior Inferior Cerebellar Artery After Blunt Head Trauma: A Case Report and Review of the Literature.
abstract: BACKGROUND
  Traumatic pseudoaneurysm of the distal posterior inferior cerebellar artery (PICA) is extremely rare. We report our experience of a case of pseudoaneurysm that developed on the PICA after blunt trauma to the head.
  
  
  METHODS
  A 55-year-old woman was transferred to our emergency department presenting with a semicomatose mental status after falling to the floor from a standing position. Computed tomography showed a small intracerebral hemorrhage and subarachnoid hemorrhage in the cerebellum. Cerebral angiography revealed no causative lesion. After 3 days, the woman was nearly mentally alert. One month later, follow-up angiography showed a small, newly developed saccular aneurysm at the distal PICA. The patient underwent surgical treatment via a midline suboccipital approach. The aneurysm was surrounded by a subacute-stage subdural hematoma and protruded into the cortex. The aneurysm was coagulated and resected. On pathologic examination, pseudoaneurysm was diagnosed without infectious inflammation. No surgery-related morbidity occurred.
  
  
  CONCLUSIONS
  Given that development of traumatic pseudoaneurysm usually is delayed, follow-up radiologic examination is required, especially for patients with severe blunt trauma.
authors.affiliation: Department of Neurosurgery, College of Medicine, Kyung Hee University, Seoul, Korea. Electronic address: nslsh@khu.ac.kr.
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Neurosurgery, Graduate School, Kyung Hee University, Seoul, Korea.
authors.forename: Jong Un
authors.initials: JU
authors.lastname: Moon
authors.affiliation: Department of Neurosurgery, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Seok Keun
authors.initials: SK
authors.lastname: Choi
authors.affiliation: Department of Neurosurgery, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Man Kyu
authors.initials: MK
authors.lastname: Choi
authors.affiliation: Department of Pathology, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Juhie
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Pathology, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Ji-Youn
authors.initials: JY
authors.lastname: Sung
mesh_terms: D017541:Aneurysm, False / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology* / Q000601:surgery; D015901:Angiography, Digital Subtraction; D003399:Craniotomy / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D016489:Head Injuries, Closed / Q000150:complications* / Q000000981:diagnostic imaging; D006801:Humans; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D020769:Posterior Cerebral Artery / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D015898:Tomography Scanners, X-Ray Computed
keywords: Blunt trauma; Brain; Posterior inferior cerebellar artery; Pseudoaneurysm; Surgery