A Study of 3D Visualization Techniques to Improve the Quality and Safety of Robot-assisted Nephron Sparing Surgery for Complex Renal Tumors.

Inclusion Criteria: 1. The imaging diagnosis is single renal cell carcinoma, clinical stage is T1N0M0-T2N0M0, and the contralateral kidney function is good. 2. Physical status and organ function allow robotic-assisted partial nephrectomy. 3. Be able to adhere to the protocol during the study. 4. The age ranges from 18 to 75 years, and there is no chronic kidney disease. 5. KPS \> 80; ECOG score: 0-1; There are no other serious concomitant diseases and the organ function is good. 6. There are no medical contraindications seriously affecting anesthesia and surgery. 7. The patient has no history of other malignant tumors in the past 5 years. 8. There is no surgical history of epigastrium and the affected kidney. 9. Estimated survival is more than 6 months, and there are no other severe diseases that reduce survival to less than 5 years. Exclusion Criteria: 1. Women who are pregnant or lactating, or who are of reproductive age and are not using effective contraception. 2. Comorbid serious medical diseases or conditions, for example, clinically severe or active heart disease, severe uncontrolled medical illnesses and infections, severe uncontrolled digestive disorder, severe electrolyte disturbance, active disseminated intravascular coagulation, major organ failure such as decompensated cardiac, pulmonary, hepatic, or renal failure, symptomatic peripheral neuropathy. Can not tolerate robot-assisted laparoscopic partial nephrectomy 3. Organ transplant recipients requiring immunosuppressive therapy. 4. There is history of other malignancies within 5 years of trial initiation, excluding cured basal cell carcinoma of the skin and carcinoma in situ of the cervix. 5. Patients who have received biological therapy or other anticancer traditional Chinese medicine within 4 weeks. 6. Patients with multiple or bilateral renal tumors or solitary renal tumors. 7. Patient without complete clinical information.