Aim : when the posterior cerebral artery originates from ICA with a small, or hypoplastic , connection with the basilar
artery, it is designated as partial fetal PCA (pfPCA) .The partial type of fPCA can be sub typed into three configurations:
embryonic, adult and transitional on the basis of diameter of the contributing arteries. The objective of the present study
was to assess the prevalence of this variant in this part of population and compare those results with available data in
literature.
Material and Method : MR 1.5 T was used for obtaining the MRA. 92 MRA were reviewed (70 male and 22 female) aged
between 20 -75 years.
Results: Partial fetal PCA (pfPCA) was observed in 50 subjects (54.3%). In males the incidence of pfPCA was (30.1%), and in
females it was (14.9%). Embryonic configuration was found to be 13% on the right side, 4.2% on the left side and bilateral in
4.2%. Adult configuration was 6.5% on the right side, 4.2% on the left side and bilateral in13%.
Conclusion: This variation occurred predominantly on the right side and showed a male dominance in this part of
population.
Key words: Circle of Willis;Fetal Posterior cerebral artery; Angiography
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