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Fig. 11B. —Contralateral posterior neck pathway in 23-year-old woman with stenosis of left brachiocephalic vein resulting from anterior mediastinal tumor. Delayed phase left upper extremity venogram shows bilateral vertebral veins (arrows) and perivertebral venous plexus (P) more clearly than early phase. RV = right vertebral vein, LV = left vertebral vein, SVC = superior vena cava.