Introduction: When we talk about precision surgery, it is necessary to have adequate preoperative planning. 3D technology allows us to locate renal lesions that are difficult to access, and in this way generate less damage to the uncompromised parenchyma. In recent years it has been seen that the incorporation of 3D models could improve surgical results, the learning curves of novice surgeons and also the understanding of patients. In Urology, the use of surgical planning with 3d models and simulation is mainly used in renal tumors. The objetive is to present a series of cases of completely endophytic renal tumors with 3D models created for surgical planning. Methods: We present a series of 5 cases with 3D models created for surgical planning. Case #1 A 47-year-old female patient with congenital solitary kidney, presents an incidental renal tumor of 2 cm completely endophytic in contact with the renal sinus, it is a R.E.N.A.L Score 9x. It was performed by lumboscopic approach Case #2 A 60-year-old male patient with bilateral renal tumors, has a Left renal exophytic formation and completely endophytic right renal lesion of 2cm R.E.N.A.L. Score 10p. The exophytic left renal tumor was treated 3 months before. It was performed by a lumboscopic approach. Case #3 A 61-year-old female patient with a completely endophytic mesorenal lesion in the left kidney of 2.5cm R.E.N.A.L. Score 12x. In this patient we performed a transperitoneal approach Case #4 A 54-year-old male patient with a completely endophytic mesorenal lesion in the left kidney of 3cm R.E.N.A.L. score 12x. It was performed by a lumboscopic approach. Case #5. A 45-year-old male patient with a completely endophytic mesorenal lesion in the left kidney of 2.5cm. RENAL Score 12x. In this patient we performed a transperitoneal approach Results: In our hospital we did 21 minimally-invasive partial nephrectomy for completely endophytic tumors between 2010 to 2022. In the last year we incorporated the use of 3D technology for surgical planning in these cases. The average days of hospitalization was 2,9. In the pathology reports, the majority of tumors were Clear-cell RCC and pT1a. Two patients had postoperative complications with Clavien dindo III. Negative margins, warm ischemia time < 25 minutes, and postoperative glomerular filtration rate < 15% were established as cut-off points with respect to the strict Trifecta criteria to ensure optimal preservation of renal function. We achieved strict trifecta results in 16 patients (76.19%) Conclusions: In our case series, 3D models seem to be useful for surgical planning and provide us with more tools to perform precision surgeries. SOURCE OF Funding: N/A
