Purpose: To evaluate the result of percutaneous injection sclerotherapy with n - butyl cyanoacrylate (NBCA) for symptomatic simple renal cysts. Materials and methods: From August 2010 to April 2011, we treated 22 patients with 23 symtomatic simple renal cysts by percutaneous injection sclerotherapy with n - butyl cyanoacrylate (NBCA). Results: We treated 22 patients (16 female, 6 male), with 23 symptomatic renal cyst (12 in right side, 11 in left side).