Is There a Role for Combination, Single-Session Selective Transarterial Embolization and Microwave Ablation for Large Renal Masses?

Purpose Thermal ablation of small renal tumors is safe and efficacious. Thermoablation of tumors greater than 3 cm has decreased efficacy and a greater risk of complications. Combined embolization and radiofrequency ablation has shown encouraging results. We report on the use of combined single-session transarterial embolization and microwave ablation to treat large renal masses. Materials and Methods After obtaining IRB approval, a review of the medical record between October 2016 and January 2020 was performed. Patients with renal tumors who underwent combined transarterial embolization and microwave ablation were assessed retrospectively. Patient demographic information, intraoperative, postoperative, and follow-up data were recorded. Results Eleven patients were identified meeting inclusion criteria. The mean age was 73 years, with 64% male, an average BMI of 26.5, and average Charleston Comorbidity Index of 6.7. Nine tumors were identified as clear cell carcinoma, one as papillary carcinoma and one as an oncocytic neoplasm. Average tumor size was 4.5 cm (2.7-8.3), with an average RENAL score of 8.5. Successful ablation with a 5 mm margin was achieved in all patients, and in all cases, ablation and embolization were performed on the same day. The only related post-procedure complication was a single groin hematoma. Surveillance was performed with CT or MRI. Average follow-up was 419.5 days (range 27-747), with no patients showing evidence of recurrence to date. Conclusions Combined single-session transarterial embolization and microwave ablation is technically feasible, safe, and efficacious in treating large renal tumors in a series of 11 patients with no recurrence to date.