1 – Superior vena cava; 2 – Azygos/Hemi-azygos vein; 3 – Ascending lumbar vein; 4 – Vertebral venous plexus; 5 – Prostatic venous plexus; 6 – Vesical venous plexus; 7 – Vesical veins; 8 – Internal iliac vein; 9 – Common iliac vein; 10 – Inferior vena cava