Aim: To present the extraperitoneal approach for the removal of peritoneal metastases in the right upper abdomen in patients with ovarian cancer and to evaluate safety and potential advantages with comparison with the traditional approach. Patients and Methods: Detailed description of the right upper quadrant peritonectomy as extraperitoneal approach. Procedure-specific short-term complications were retrospectively analyzed in a cohort of patients. Results: Sixty-four patients were included. Fullthickness diaphragmatic resection was performed in 17% of primary cases, and in 44% of the patients with recurrent ovarian carcinoma. The rate of complete cytoreduction (CC-0) was 70%. The most common postoperative complication was pleural effusion (32%). Conclusion: The extraperitoneal approach for peritonectomy of the right upper quadrant in patients with ovarian cancer is feasible, with improved access to the right subdiaphragmatic area. This enables a high rate of complete cytoreduction, and simplified and safe surgical dissection in an uncontaminated area under secured vascular structures. The early postoperative outcomes are comparable to those of the traditional transperitoneal approach.In industrialized countries, ovarian cancer is the leading cause of gynecological cancer-related mortality. The poor prognosis is attributed to the fact that two-thirds of patients have advanced-stage ovarian cancer at diagnosis (1). The majority of these women have extensive intra-abdominal disease with significant peritoneal involvement at the time of diagnosis, resulting in low overall cure rates. The most important prognostic factor remains the residual disease status after cytoreductive surgery (CRS) (2-4).In advanced-stage ovarian cancer, up to 40% of patients present with bulky metastases in the diaphragmatic peritoneal region, mainly on the right side (5-7). Metastases appear in this region as a consequence of transcoelomic tumorous implants from the floating malignant cells in the peritoneal fluid, which circulates clockwise in the peritoneal cavity (8).Maximal effort to achieve complete cytoreduction with the resection of diaphragmatic metastases is associated with improved survival (5,9,10). For this reason, gynecological oncologists commonly perform upper abdominal surgery (9,11). Not only in the primary but also in the recurrent setting, complete cytoreduction seems to deliver survival benefit. Recently results from the DESKTOP III trial, presented at the American Society of Clinical Oncology meeting in Chicago, highlighted a survival benefit in favor of secondary complete CRS in comparison to chemotherapy alone (12).Diaphragmatic peritonectomy and full-thickness resection constitute an effective way to remove diaphragmatic carcinomatosis and achieve complete cytoreduction. These interventions frequently result in intrathoracic and pulmonary complications, although long-term morbidity is uncommon. Diaphragmatic surgery is mostly limited to stripping. However, if the tumor infiltrates the muscle fibers of the diaphragm, ...