Long-term outcome of robotic partial nephrectomy for renal angiomyolipoma

Summary Background/Objective To present the long-term result and efficacy of robotic partial nephrectomy (RPN) for renal angiomyolipomas (AMLs) with perioperative outcome and renal function preservation. Methods From September 2006 to October 2014, the database of a single medical center was reviewed and patients who underwent RPN for AMLs were enrolled. The patient demographics, perioperative complications, and postoperative outcomes were analyzed. Results We identified 23 patients who were treated with RPN for renal AMLs. The average age was 52.7 (± 9.9) years, and 20 (87%) patients were female. The median size of the resected AML was 5.2 [interquartile range (IQR)=3.1–6.8] cm. The median estimated blood loss was 100 (IQR=50–225) mL, and three (13%) patients required blood transfusion. Perioperative complications occurred in six (26%) patients and none of them are higher than Clavien Grade II. The median estimated glomerular filtration rate at 3-month and the latest follow-ups were 103 (IQR=85.5–112) mL/min/1.73m 2 and 104 (IQR=90–112) mL/min/1.73m 2 , respectively, with a median of 89.6% (IQR=84.2–100) and 86.9% (IQR=81.3–97.8) preservation, respectively. The median follow-up period was 40 (IQR=30.5–61.5) months. None of the patients developed complications requiring a second intervention or local recurrence of AML. Conclusion A long-term follow-up of RPN for renal AMLs revealed good preservation of renal function with a low complication rate. It may be considered as a reliable method to manage renal AMLs.