title: Aneurysm in the anterior inferior cerebellar artery-posterior inferior cerebellar artery variant: Case report and review of literature.
abstract: BACKGROUND
  There are variations in the anatomy of the vertebrobasilar system amongst which the Anterior Inferior Cerebellar Artery-Posterior Inferior Cerebellar Artery (AICA-PICA) variant is thought to have a prevalence of 20-24% (based on retrospective studies). Despite this, aneurysms of the AICA-PICA variant are rare. We present a case of an AICA-PICA aneurysm and discuss its presentation and management, along with a review of literature.
  
  
  METHODS
  We describe the case of a 35 year old female who presented with signs of meningismus. On the basis of radiological imaging it was initially misdiagnosed as a thrombosed arteriovenous malformation (AVM). The patient was eventually discharged with a plan of interval imaging and interventional radiology (if required). The patient presented again with similar signs and symptoms. Re-evaluation of imaging revealed an aneurysm of the AICA-PICA variant which was managed surgically.
  
  
  CONCLUSIONS
  Aneurysms of the AICA-PICA variant are rare. The radiological features and surgical management represent a unique clinical entity and are discussed below.
  
  
  CONCLUSIONS
  The prevalence of the AICA-PICA variant might be high but aneurysms in this vessel are rare. The scant knowledge available on this subject makes it a diagnostic difficulty.
authors.affiliation: Section of Neurosurgery, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan. Electronic address: saad.akhtar@aku.edu.
authors.forename: Saad
authors.initials: S
authors.lastname: Akhtar
authors.affiliation: Medical College, The Aga Khan University, Karachi, Pakistan. Electronic address: abdulazeem22@hotmail.com.
authors.forename: Abdul
authors.initials: A
authors.lastname: Azeem
authors.affiliation: Section of General Surgery, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan. Electronic address: amyna.jiwani@gmail.com.
authors.forename: Amyna
authors.initials: A
authors.lastname: Jiwani
authors.affiliation: Section of Neurosurgery, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan. Electronic address: gohar.javed@aku.edu.
authors.forename: Gohar
authors.initials: G
authors.lastname: Javed
keywords: AICA-PICA variant; Aneurysm; Case report