Trans-peritoneal vs. retroperitoneal robotic assisted partial nephrectomy in posterior renal tumours: need for a risk-stratified patient individualised approach. A systematic review and meta-analysis

To systematically review world literature and compare peri-operative outcome including operating time (OT), estimated blood loss (EBL), warm ischemia time (WIT), length of stay (LOS) and complications between retroperitoneal robotic assisted partial nephrectomy (RP-RAPN) and trans-peritoneal robotic assisted partial nephrectomy (TP-RAPN) for posteriorly located renal masses. All randomised trials and observational studies comparing RP-RAPN and TP-RAPN for posteriorly located renal masses were considered. The GRADE approach (Grading of Recommendations Assessment, Development and Evaluation, GRADE) was used to rate the quality of evidence. 82 potential publications were identified. 3 were included in the review. All three studies were observational comparative studies. 347 and 550 patients underwent RP-RAPN and TP-RAPN, respectively, for posteriorly located tumours. There was statistically significant difference in LOS between the 2 techniques, favouring the RP-RAPN cohort: risk ratio (M-H, random, 95% CI), − 0.42 [− 0.67, − 0.18], p