“Commonly, valves in these lengthy spermatic veins reduce again pressure, but if the valves fall short, this very long column of blood from the kidney area down to the testicle might cause dilation [widening] in the veins while in the scrotum.” Varicocele, an enlargement of the veins inside the scrotum, https://www.sgvascularctr.com/a-guide-to-varicocele-treatment-in-singapore/