hi, surgery for epididymal cyst
involves removal of the cyst through a small incision in scrotum
. Usually it spares the semen tube. There is a small chance of semen tube getting compressed due to healing process later on. But if the other testis and semen tube (vas) are normal, your semen will still be adequate. If your cyst is not too painful, I would suggest you can postpone it till after completing your family. take care.