Robotic major abdominal surgeries are popular worldwide, yet very few clinical studies have investigated the effects of robotic surgery setup on respiratory outcomes. In this prospective observational study, it is aimed to demonstrate the change in ultrasonographic condition of the lungs throughout the robotic surgery and its relation with respiratory outcomes. Robotic radical prostatectomy patients without any preexisting lung or cardiac pathology were enrolled in the study. Lung ultrasound score (LUS) was chosen to evaluate lungs perioperatively in three different time points that is as follows: 5 min after intubation (T1), before extubation (T2), and 30 min after extubation (T3). Blood gas analyses were made at the same time points. Primary outcome was the change of LUS comparing T3 versus T1. Secondary outcomes included intraoperative change of LUS, severe postoperative pulmonary complication incidence, unplanned intensive care unit (ICU) admission incidence, comparison of oxygenation via PaO