The right testicular vein, also known as the spermatic vein or the male gonadal vein is responsible for carrying deoxygenated blood from the testicals to the inferior vena cava. The spermatic vein also carries deoxygenated blood to its different tributaries. The vein begins in the back of the testes, and then accepts tributaries from the epididymis. After joining the tributaries the vein forms into a convoluted plexus, which is labeled the pampiniform plexus. The pampiniform plexus is then the greatest mass forming the spermatic cord. The testicular veins are paired veins, meaning each one supplies one of the testes. Varicocele is a medical condition that the male can develop if the valves are not working properly and the blood starts to backflow or if the vein is compressed, and the veins begin to swell. The symptoms of varicocele include pain in the testicles along with shrinking or a heavy feeling. The right testicular vein is less likely to develop this condition, and 98 percent of cases documented are in the left testicular vein.