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Aneurysms preferentially blossom in the Circle of Willis, with the anterior communicating artery (Acomm) being the most common location for rupture. The posterior communicating artery (Pcomm) is the second most common site. Saccular aneurysms are more likely than fusiform to rupture. #Anatomy #Epidemiology #EM #Neuro #NSG #Aneurysm #Location #Frequency #CircleOfWillis #Willis