Scientific Program

Manipal Academy of Higher Education, India

Title: Anatomical variants of the circle of willis: A computed tomography angiography based study

Biography:

Knowledge of the presence of normal variants of Circle

of Willis (COW) plays a crucial role in the diagnosis and management of cerebro vascular disorders1. Based on

radiological and anatomical studies, no more than 50% of the

general population have a complete Circle of Willis (COW) 2.

It is proven that Lack of knowledge of the anatomical variants

of COW is the cause of approximately 10% of medical errors3.

Sensitivity (81%–90%) and specificity (93%) of multi-detector

CT angiography (CTA) are reported to be high in identifying the

anatomical variants in Circle of Willis (COW)4. Aim of this study

is to identify the frequency of anatomical variants in Circle of

Willis by using Computed Tomography Angiography (CTA)

and to determine the gender association of COW anatomical

variants. In this retrospective study COW CTA images of 400

patients are reading by a radiologist to identify the variants by

using Multi Planar Reconstruction (MPR) mages, Maximum

Intensity projection (MIP) images and Volume Rendering (VR)

images.. Variants present in anterior circulation (A1 segment,

Anterior Communicating artery (AComA) and A2 segment),

posterior circulation (P1 segment, Posterior Communicating

artery (PComA) and P2 segment), Middle cerebral artery

(MCA), Basilar and vertebral artery, internal carotid artery

(ICA), and others will be studied. Data will be analyzed by

using SPSS and frequency of variants will be identified. Chi-

Square test will be used to find out the association of variants

among gender.

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