The patient, a young male, was found to have a right kidney tumor due to hidden pain in his lower back in an outside hospital, and was considered to have a right renal malformation tumor in an outside CT examination. Due to the huge tumor and the previous interventional surgery, the patient was closely adhered to the surrounding large blood vessels and tissues. During the operation, a small amount of the tumor was first taken and sent to frozen rapid pathology, which was reported as benign tumor. The tumor size was 17x7x10, and the postoperative pathology report was: renal vascular smooth muscle lipoma CT showed a huge tumor in the right kidney intraoperative separation of tumor resected tumor Surgical difficulties: 1. the patient’s tumor was huge; 2. the patient had undergone interventional surgery in a foreign hospital before surgery, and the tumor was found to have strong adhesions with surrounding large blood vessels and other tissues intraoperatively; 3. the residual kidney tissue needed to be protected; 4. the patient had RH negative blood type, and the blood source was very The patient is of RH-negative blood type and the blood source is very tight, which puts higher demands on the operation.