With readily available cross-sectional imaging, small renal masses are increasingly being detected in asymptomatic individuals, prompting the need for further evaluation to exclude malignancy. Demonstration of contrast enhancement with a dedicated contrast-enhanced CT or MRI scan of the kidneys is the gold standard for radiologic diagnosis of renal cell carcinoma (RCC). However, both CT and MRI contrast agents are contraindicated in patients with renal impairment.
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