Anatomical variations in circle of willis in a random study group
Journal Title: INTERNATIONAL JOURNAL OF RECENT TRENDS IN SCIENCE AND TECHNOLOGY - Year 2016, Vol 20, Issue 1
Abstract
Objectives: To evaluate and to describe the prevalence and pattern of Circle of Willis (CW), arterial variants and associated anomalies in noncontrast 3D-TOF-MRA in a random study group and to investigate whether any sex- or age-related differences could be found in circle morphology. Materials and Methods: In a descriptive study, 180participants (108 men and72 women); mean age, 68 years referred for neuroischemic study protocol from June 2015 to June 2016 were included in the study. Images were obtained with the sequence of spoiled gradient-recalled acquisition (SPGR) using a 1.5-tesla MR scanner (Achieve; Philips Medical Systems). Images were reviewed for CW anatomy and configuration. Observations and results: The prevalence of complete configuration of the circle was50 % in younger than 40 years and 45% in older than 40 years and is slightly higher in females than males. Complete anterior CW is more common with incidence of 75% in < 40 years and 65% in > 40 years individuals. The most common anterior circle variant is type A with a prevalence of 40-45% and the least common is type C. The most common posterior circle variant was type E with incidence of 24% in less than 40 years and 17% in >40 years. Overall, CW variants are slightly more common among the women in comparison to men. Conclusion: The morphological variations demonstrated by TOF-MRA in our study provide an important reference source for CW variations in the regional population. Incidence of associated anomalies, like aneurysm is comparable to that described in literature.
Authors and Affiliations
Aarthi Parthasarathy, Sachin G Shatagar
Keywords
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