One-year Results of Single-session Sclerotherapy with Bleomycin in Simple Renal Cysts

Abstract

PurposeTo evaluate the efficacy and safety of single-session percutaneous needle aspiration and single-injection bleomycin sclerotherapy for the treatment of simple renal cysts. Materials and MethodsA total of 66 renal cysts in 53 patients were treated by single-session percutaneous needle aspiration and single-injection bleomycin sclerotherapy under computed tomography (CT) guidance. Symptomatic (n = 31) and asymptomatic cysts (n = 22) with maximum diameters greater than 5 cm were treated. As much liquid content of each cyst was aspirated as possible, and bleomycin was injected and remained in the cyst. Follow-up was performed with ultrasonography or CT every 3 months until 1 year, and cyst volume was calculated before and after sclerotherapy. Therapeutic response was assessed by cyst volume reduction rate (VRR) and classified as complete regression (CR; ie, invisible), near-CR (ie, VRR>85%), partial regression (PR; ie, VRR of 50%–85%), or no response (NR; ie, VRR<50%). Medical records were reviewed to analyze complications. ResultsCysts refilled partially in the initial stage after sclerotherapy and decreased gradually in size over the entire follow-up period. At 1-year follow-up, the overall response rate was 98.5% (65 of 66), with CR in 31 cysts (47.0%), near-CR in 24 cysts (36.4%), PR in 10 cysts (15.1%), and NR in one cyst (1.5%). No major complications were encountered. ConclusionsSingle-session percutaneous needle aspiration and single-injection bleomycin sclerotherapy is a simple, safe, effective, well tolerated alternative technique for management of simple renal cysts.