Safety and delayed intervention rates of active surveillance for small renal masses in an elderly population

The incidence of incidentally detected renal masses thought to represent renal cell carcinoma (RCC) has increased with widespread utilization of cross-sectional imaging, with many of these lesions being considered small renal masses (SRMs), ≤4 cm in maximal diameter (1,2). These lesions were historically treated surgically, with either radical nephrectomy or nephron-sparing surgery (NSS), or with percutaneous ablation.