A hydrocele is a collection of fluid in a sac in the scrotum next to a testes (testicle). It usually occurs on one side, but sometimes a hydrocele forms over both testes. A cut is made into the skin over the hydrocele. The liquid is emptied out and the testicle will be examined. If it is all right, the double coverings of the testicle are stitched up to stop the liquid building up again. The operation is usually done as a day case. This means that you come into hospital on the day of the operation and go home the same day. You may need to stay in for a day or two, if you are over 50, having trouble passing urine, have other illnesses, or if you cannot manage at home.