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B-mode detection of venous stenosis. (A) Right cervical side, high-resolution B-mode image, transversal access: common carotid artery (CC) with cerebral inflow (red), and right internal jugular vein (IJVr) with regular cerebral outflow (blue). (B) Same patient, left side: stenoses of the left internal jugular vein (IJVl) due to annulus (black arrows) with reflux (red) and severe reduction of the lumen.
