Robotic-assisted laparoscopic retroperitoneal lymph node dissection in post chemotherapy residual mass in testis cancer Introduction: The laparoscopic retroperitoneal lymph node dissection (L-RPLND) has shown results at least comparable to open surgery in terms of perioperative complications and oncological results, but its application in the post chemotherapy scenario is still matter of study. The development of robotic surgery and its advantages over laparoscopic surgery, make this an attractive option for complex procedures. We report our initial experience with robotic-assisted retroperitoneal lymph node dissection (R-RPLND). Methods: We describe the cases of two patients who underwent R-RPLND due to a Post Chemotherapy residual mass of a non-seminomatous testicular cancer. Results: Two patients, 27 and 30 years old, presented with retroperitoneal residual mass after 4 and 6 cycles of Bleomicin, Etoposide and Cis-Platinum. The fi rst patient had a 4.3 cm left para-aortic mass and the other had a 6 cm mass behind the third portion of the duodenum. The mean surgical time was 255 minutes (210-300), with an estimated mean blood loss of 450 cc (100-800) and a mean hospital stay of 60 hours (72-48). The pathologic result was Teratoma in both cases. There was no perioperative morbidity. Conclusions: We believe that R-RPLND is a feasible and safe alternative in selected patients. However still needs more experience and longer follow up to asess its oncological outcome.