This study evaluates the influence of surgical and anesthesia-related variable on atelectasis formation during laparoscopic gynecologic oncologic surgery by lung ultrasound.

Approximately 50% of patients undergoing general anesthesia are hypoxemic. Anaesthesia, paralysis, high concentrations of oxygen, inadequate level of PEEP, capnoperitoneum, Trendelenburg position all result in persistent atelectasis. Lung ultrasound is a safe and accurate bedside tool useful to study lung aeration. The aim of the investigator's study was to assess the impact of general anesthesia and laparoscopic gynecologic oncologic surgery on post-operative atelectasis and related oxygenation changes using lung ultrasound.

Inclusion Criteria:

• Patients older than 18 yo undergoing laparoscopic surgery for gynecologic surgery who provide written informed consent.

Exclusion Criteria:

• age < 18 yo;
• pregnancy;
• refused to partecipate;
• known pulmonary metastasis;
• preexisting pulmonary conditions (COPD, pleural effusion, pulmonary consolidations, lung edema, pulmonary embolism);
• anesthesia with mechanical ventilation in the 2 weeks.

All patients >18yo undergoing laparoscopy for ginecologic oncologic surgery willing to participate to the study