Dilated veins: Dilated veins in the left side of the scrotum are called a varicocele and are caused by backflow of blood and poor function of valves in the veins. They are not serious except that they can cause infertility. This can be determined by a sperm analysis. If you would like to discuss this further, please ask for an inbox consult. Dr. Long
Answered 11/28/2017
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