1 — Anterior intercostal veins; 2 — Azygos vein; 3 — Posterior intercostal veins; 4 — Right superior intercostal vein; 5 — Right subclavian vein; 6 — Right internal jugular vein; 7 — Left superior intercostal vein; 8 — Left supreme intercostal vein; 9 — Left internal jugular vein; 10 — Left subclavian vein; 11 — Brachiocephalic vein; 12 — Accessory hemi-azygos vein; Superior hemi-azygos vein; 13 — Internal thoracic veins; 14 — Hemi-azygos vein; Inferior hemi-azygos vein; 15 — Right superior epigastric vein; 16 — Right musculophrenic veins; 17 — Left
subcostal vein; 18 — Inferior vena cava
