MP31-08 ESTIMATION OF SPARED RENAL PARENCHYMA BY ROBOTIC APPROACHES TO PARTIAL NEPHRECTOMIES

INTRODUCTION AND OBJECTIVES:Tumor enucleation (TE) has the potential to optimize parenchymal preservation and potentially yields better functional outcomes than standard partial nephrectomy (SPN). The objective of our study is to compare the surgical precision of SPN and TE for optimizing nephron-mass preservation specifically in the operated kidney and comparing that to functional outcomes.METHODS:Robotic partial nephrectomy patients who had suitable pre- and post-operative imaging studies for analysis of parenchymal mass preservation were included. Of 337 robotic partial nephrectomies performed between 2011 and 2017, 174 met our inclusion criteria. Computed tomography or magnetic resonance imaging were required to be less than 3 months prior and 3-12 months after surgery. Parenchymal mass preservation and surgical precision were estimated for both TE and SPN; precision was defined as actual postoperative parenchymal volume versus predicted postoperative parenchymal volume, presuming a loss of a 5-mm rim...