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Well his age is NOT a reason to not operate. IF his blood and urine tests are normal and he is otherwise healthy then an ultrasound of the mass and possible surgical removal is indicated. I say ultrasound because we need to know if the mass is adhered to other tissues and how far it infiltrates into things. Also need to know how much blood supply it has.
So I would start with an ultrasound and possible aspirate/biopsy to find out what you are dealing with.
How big is the mass? and could this be a something other than a cancer? That is why the ultrasound.