Definition of recurrent ovarian malignancy Broadly speaking, recurrent ovarian malignancy can be divided into two conditions, i.e. recurrence and uncontrolled. The definitions of each are as follows: 1. Recurrence: i.e., after achieving clinical complete remission after treatment, the tumor reappears after six months. 2. Uncontrolled: i.e., the tumor reappears within six months after achieving clinical complete remission after treatment; or the tumor persists after treatment. Surgical treatment of ovarian malignant tumor 1. Surgical objectives: (1) to remove or reduce the lesion; (2) to relieve the symptoms (intestinal obstruction). (2) To separate adhesions, relieve obstruction, intestinal rerouting and enterostomy. (2) Tumor cytoreduction again: (1) complete or non-complete resection of recurrent foci; (2) partial or complete resection of metastases or metastatic organs such as intestine, liver, spleen, lymph nodes and bladder. (3) Principles of surgical selection 1. Re-dissection: Where the organs and tissues of the abdominal cavity are found to be diffusely recurrent and metastatic at the time of surgery (twisted intestine 0); metastases that are difficult to resect (metastases in the porta hepatis, paranephric veins, extra-abdominal metastases and multiple metastases in the liver parenchyma); massive ascites, intestinal obstruction that is difficult to relieve and extensive adhesions and anatomical disorders of the organs. In this case, the aim of surgery is to explore, relieve symptoms and improve the quality of survival. If re-tumor cytoreductive surgery is performed, there are many postoperative complications and no benefit to the patient. 2. Re-tumor cytoreduction: Any patient with recurrence with well-defined focal lesions found at the time of surgery, more than >12 months after completion of first-line chemotherapy, good general condition or life status score and young age (<50 years) is estimated to complete ideal tumor cytoreduction. Performing re-tumor cytoreduction in the above mentioned circumstances has fewer complications and can achieve the desired therapeutic goals for patients with