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This video case shows an occlusion of the common carotid artery (CCA) and the collateral pathway developed in response to such occlusion. The developed collateral pathway provides flow to the internal carotid artery (ICA) via retrograde flow through the external carotid artery (ECA) which receives retrograde flow from one of its main branches.
TAKE HOME MESSAGE: in presence of a CCA occlusion, flow is often preserved through the ICA via retrograde flow in the ECA. Colour flow Doppler is essential in defining flow direction and to confirm occlusions of the carotid arteries.
Occlusion of the common carotid artery: collateral pathway | Ultrasound
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