Hi, The testes are two in number, one on each side of the scrotum, and produce the sperm which are stored in structures called epididymes and this sperm is carried out through the vas into the male urinary tract. Often, an infection of the urinary tract can spread rapidly backwards through the vas and involve the epididymes, and can cause swelling and pain. If the infection causes an abscess, the pus needs to be let out surgically but otherwise most such infections respond very well to antibiotics. in your case, I suggest you discuss with the treating surgeon / urologist regarding the absolute indications for any surgery, just to confirm that future fertility is not compromised. Hope I have been able to help you. Regards.