Tissue oximetry obtained from peripheral muscle measures the state of tissue oxygenation of various organs and, as already widely described in the literature, can be used to measure the state of kidney's tissue oxygenation. However, there is no evidence in the existing scientific literature on the use of muscle tissue oximetry in patients undergoing cytoreductive surgery for ovarian cancer with hyperthermic intraperitoneal chemotherapy. The primary objective of our study is to evaluate whether there is a correlation between average intraoperative muscle tissue oximetry below 65% (a value which is considered critical in the literature for the resulting cellular damage) and postoperative renal damage in patients undergoing cytoreductive surgery with hyperthermic intraperitoneal chemotherapy for ovarian cancer.