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At his age, there is little to no chance that it will come down any further. The fact that it is an undescended testicle makes it at higher risk for developing cancer, and the risk does not decrease if it is brought down surgically. The only benefits from brining the trsticle down to the scrotum are for cosmetic reasons and to allow him to do testicular self exams to monitor for the development of any masses in the testicle. Yearly ultrasound can be performed as an alternative, but in my experience, men never follow through with this as this is something he will have to do until he is in his 50s or so. Surgery is the best option at this point and will be the most convenient for him in the long run. Hope this helps.
If the orchidopexy is done before age 13, the risk of cancer is 2.23 times the normal population. If it is done after age 13, the risk is 5.4 time normal. Therefore, the risk is twice as high is he waits until after age 13. I would recommend it be done now.
Yes. The lower the testicle is, the less the risk of cancer. Yes. Screening could detect a cancer that could be acted upon early. I don't know the exact numbers off the top of my head in the normal population, but it is relatively rare.