Evaluating the circle of Willis aneurysms location and relationship with its variations by multi detector CT angiography

Computed tomography angiography (CTA) is increasingly used for non - invasive imaging of the cerebrovascular diseases. This study aimed at evaluating the circle of Willis location and relationship with its variations by multi detector CT angiography. This descriptive analytical study was conducted on 240 healthy participants who underwent 64 - section CTA All participants underwent cranial CTA with a 64 - section multidetector CT scanner All component vessels at the circle of Willis were assessed in each individual. In interpretation of the C T angiograms, the observer assessed the presence or absence of each arterial segment in the circle of Willis. A complete circle of Willis was seen in 68 (28.3%) of 240 subjects. An incomplete anterior and posterior circle of Willis was found in 36 (15%) of 240 subjects. The remaining 136 (56.6%) subjects had partially complete circle of Willis configura tion. The most common type of circle of Willis in a single subject was anterior variant A and posterior variant E. A higher prevalence of compromised posteri or collaterals was observed in this Iranian population compared to western populations. ( Abolhasan Shakeri , Mohammad Hosein Abd Karimi , Morteza Ghojazadeh, Akbar Teymouri . Evaluating the circle of Willis aneurysms location and relationship with its variations by multi detector CT angiography . J Am Sci 2013;9( 10s ): 86 - 90 ). (ISSN: 1545 - 1003). http://www.jofamericanscience.org . 1 6