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. 2017 Jan 1;30(2):109–119. doi: 10.1177/1971400917690166

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Figure 6. — (a) Labeled anatomical illustration of the anterior circulation of the Circle of Willis. (b) and (c) Collateral circulation as a modifiable variable in determining the final length of thromboembolus. (b) A short ‘original’ MCA thromboembolus in a patient with good antegrade and retrograde collateral circulation (red arrows) preventing blood stasis. (c) Conversely, in a patient with poor collateral circulation there is blood stasis on either side of the ‘original' thromboembolus promoting new thrombus formation. MCA: middle cerebral artery.