• Shengnan Cai, Rui Dai, Junqiao Mi, Shiduan Wang, and Yan Jiang.
• Department of Anesthesiology, the Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
• Medicine (Baltimore). 2020 Oct 9; 99 (41): e22625.

RationaleGiant ovarian tumors are very rare. Patients with large ovarian tumors appear similar to pregnant women and morbidly obese patients. The management of such patients is associated with significant mortality. Therefore, additional clinical research is essential to understanding the perioperative complications of this disease.Patient ConcernsWe report the perioperative management of a patient with a giant ovarian tumor that contained 23 L of fluid who underwent tumor resection. Given the infrequency of these giant ovarian tumors, a detailed anesthetic plan and postoperative respiratory support strategy were tailored to address the patient's hemodynamic and respiratory risks, as well as to minimize potential complications, including supine hypotensive syndrome, re-expansion pulmonary edema, and postoperative intestinal ileus. To prevent supine hypotensive syndrome, the patient used a mild left-sided position (10∼20°) after admission until the tumor was removed. In order to prevent re-expansion pulmonary edema (RPE), the intraoperative ventilator mode was set to pressure-controlled ventilation (PCV), with the addition of 8 cmH2O positive end-expiratory pressure (PEEP). The airway pressure was lower while maintaining a certain tidal volume. In the ICU, in the ventilator mode, we use pressure support ventilation as well as PEEP and adjust it according to the patient's spontaneous breathing situation and blood gas analysis to prepare for further detach from the respirator and extubation. And we prevent the occurrence of postoperative intestinal ileus by placing the abdominal binder after the operation.DiagnosisMucinous cystadenoma of the left ovary.InterventionsThe patient underwent exploratory laparotomy with debulking of the left ovarian mass, transabdominal hysterectomy with bilateral salpingo-oophorectomy, complete omentectomy with appendectomy, and pelvic lymphadenectomy.OutcomesAfter surgery, the patient experienced intestinal distention. Up to now, the patient has recovered well.LessonsA multidisciplinary approach is essential. Knowing the possibility of complications and choices for management can lead to favorable outcomes in such rare cases. This case reminds us that postoperative complications such as postoperative intestinal ileus may be fatal.

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