Mass in kidney: To find out what the mass is, you need to see a urologist. For a mass this size, < 4 cm, 20-30% are non-cancerous. You will need to get a biopsy of this mass in order to get tissue from it to arrive at a diagnosis. A urologist can obtain the biopsy from your kidney. If it is malignant, then an oncologist will be the physician to manage the problem.
Answered 1/27/2020
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