1 INTRODUCTION Small renal masses are diagnosed with increasing frequency.1 Recommended management of these masses has changed over time, with a trend away from radical nephrectomy (RN) toward less invasive approaches including partial nephrectomy (PN), thermal ablation (TA), and active surveillance (AS).2, 3 The shift from RN to PN has been driven by observational4 and experimental5 data showing long-term oncologic equivalence between RN and PN and lower risk of new-onset chronic kidney...