Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Renal oncocytoma ?
    ### Response:
    Renal oncocytoma is a benign (noncancerous) growth of the kidney. They generally do not cause any signs or symptoms and are often discovered incidentally (by chance) while a person is undergoing diagnostic imaging for other conditions. Some people with renal oncocytoma will have abdominal or flank pain; blood in the urine; and/or an abdominal mass.
    