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Absent left external jugular vein (3D-VR). (A) Right lateral view; (B) left lateral view. 1. right external jugular vein; 2. anterior branch of the right retromandibular vein continued as anterior jugular vein at the anterior border of the sternocleidomastoid muscle; 3. anterior branch of the left retromandibular vein continued as anterior jugular vein.
