title: A cadaveric study of bilateral configuration of posterior bifurcation of posterior communicating artery in Indian population.
abstract: BACKGROUND
  Various studies have been done regarding variations of circle of Willis, but few literatures are available about the detail configurations on Indian population. Posterior communicating artery is the main collateral channel between the vertebrobasilar and carotid system. It may act as a main source of blood flow via posterior cerebral artery if fetal configuration is present. Aim of the study is to see the bilateral configurations to compare the blood supply of both cerebral hemispheres via posterior cerebral artery in human cadavers.
  
  
  METHODS
  Fifty six formalin fixed brains were used for study. The specimens were classified into 3 types and 21 subtypes according to the configuration of the vessel of both hemispheres. As hemodynamic balance is dependent on the calibre of the vessel, the diameter of the arteries were also taken into consideration. Pearson's correlation had been done.
  
  
  RESULTS
  In present study type I is 57.2%, type II is 37.5% and type III is 5.4%. Incidence of unilateral fetal type posterior cerebral artery is in high percentage (33.9%). Greatest diameter of posterior communicating artery is 3.8mm on right and 3.6mm on left side. Significant correlations also have been found between arterial segments of different types.
  
  
  CONCLUSIONS
  It is expected that the study will help to enrich the knowledge about the arterial predominance of origin of posterior cerebral artery of both cerebral hemispheres in normal or variant cases and its effect on perfusion images.
authors.affiliation: Assistant Professor, Department of Anatomy, Institute of Post-Graduate Medical Education & Research , Kolkata, West Bengal, India .
authors.forename: Anubha
authors.initials: A
authors.lastname: Saha
authors.affiliation: Associate Professor, Department of Anatomy, Midnapore Medical College , Midnapore, West Bengal, India .
authors.forename: Aniruddha
authors.initials: A
authors.lastname: Sarkar
authors.affiliation: Assistant Professor, Department of General Medicine, Bankura Sammillani Medical College , Bankura, West Bengal, India .
authors.forename: Shyamash
authors.initials: S
authors.lastname: Mandal
keywords: Anastomotic channel; Cerebral hemisphere; Circle of Willis