Postoperative complications of retroperitoneal tumor Postoperative bleeding is the most common complication of retroperitoneal tumor after surgery, which can cause quite serious consequences if not treated in time. The trauma caused by retroperitoneal tumor surgery is often very large, and although thorough hemostasis is performed before the end of surgery, the coagulation mechanism of such patients often has certain problems. Our institution routinely continues to use larger doses of hemostatic agents postoperatively. The patient is strictly observed for changes in the amount of hemoglobin and the nature and amount of abdominal drainage fluid. If the patient’s abdominal drainage fluid is thick and bloody in volume, coupled with a persistent decrease in hemoglobin volume, intra-abdominal hemorrhage should be highly suspected. If there is no improvement after appropriate blood supplementation, surgical exploration for hemostasis should be considered. Most reoperations are not seen to have significant vascular bleeding with more localized blood clots. This clot can consume a large amount of clotting factors. The clot is removed surgically, flushed with plenty of saline, and the drainage is repositioned. Platelet or fresh blood input and enhanced coagulant therapy can usually achieve hemostasis. We have encountered one case of surgical resection of a recurrent giant retroperitoneal liposarcoma with intraoperative damage to the external iliac vein, which was repaired. Postoperatively, anticoagulation therapy was prepared to be started after the condition was stabilized. However, the surgeon concerned started to give anticoagulant therapy on the same postoperative night, and no attention was paid to the nature and amount of abdominal drainage until the patient developed severe symptoms of shock, and resuscitation was not started until the patient finally died of hemorrhagic shock. These patients have a large volume of preoperative abdominal cavity contents, and after tumor removal, the abdominal cavity contents are obviously reduced, and then there is the function of generating negative pressure, which may also be a factor of postoperative bleeding. Our hospital uses more thick dressings placed on the abdominal wall to do certain pressure bandages, which can also play a role in reducing postoperative bleeding. Second, venous thrombosis and embolism for a rare complication, our hospital encountered a case of smooth muscle sarcoma of the inferior vena cava who underwent partial resection and repair of the inferior vena cava and was treated with anticoagulation after surgery. The patient suddenly developed respiratory distress at the 7th postoperative day, and it was later confirmed that a venous embolus had dislodged causing pulmonary embolism. For patients who have undergone venous repair, close attention should be paid to postoperative observation and the amount and duration of anticoagulation therapy should be enhanced. Complications of renal dysfunction The retroperitoneal tumor is often combined with one side of nephrectomy, and there may be a long period of hypotension during the operation, coupled with large surgical trauma, so renal dysfunction may occur after the operation. Therefore, the changes of renal function should be closely observed after surgery. In the application of antibiotics, attention should be paid to avoid drugs with toxic side effects on the kidney. Fluid supplementation should be appropriate, and diuretics can be used as appropriate. Gastrointestinal complications The operation of retroperitoneal tumor is long, and the harassment of abdominal viscera is large. Therefore, the recovery of intestinal function after surgery is slow, and if the intestinal paralysis is heavy, more serious abdominal distension can occur. Therefore, postoperative gastrointestinal decompression should be performed for a longer period of time. If partial small bowel or colon resection anastomosis is done intraoperatively, postoperative complications of anastomotic fistula may occur. In such cases, if there is no severe peritonitis and local drainage is clear, parenteral nutrition support is available and most patients can recover. If peritonitis is evident, early surgery should be performed, with intestinal repair or temporary fistula depending on the situation. If the pancreas is injured during surgery or partial pancreatectomy is performed, there is a risk of postoperative pancreatic fistula. Such patients should usually have a double set of drains placed intraoperatively, and drugs to reduce pancreatic fluid secretion such as growth inhibitors should be given postoperatively. It should be treated with intravenous nutritional support for a longer period of time. V. Intra-abdominal infection or incisional infection These complications occur less frequently and are no different from the complications of general postoperative infection. In conclusion, intraoperative complications are the main problem of surgical complications of retroperitoneal tumor. If the characteristics of retroperitoneal tumor can be understood and the surgical points mentioned above can be strictly followed, many surgical complications can be avoided. Postoperative complications mainly depend on close observation, timely detection and treatment, and generally do not cause serious consequences.