Figure 1

(a) Abdominal CT acquired in May 2005.CT images revealed a renal cyst approximately 9 cm in diameter in the middle of the left kidney. Renal cyst sclerotherapy with minocycline was performed in May 2005. (b) Abdominal CT acquired in November 2005. After sclerotherapy with minocycline, the renal cyst regrew to its original size within 6 months. Therefore, sclerotherapy with 95 % ethanol was administered. (c) Abdominal CT from July 2007. The CT images showed no regrowth of the renal cyst nearly two years after second-line ethanol sclerotherapy. (d) Enhanced abdominal CT from January 2009 revealed a cystic renal mass approximately 7 cm in diameter containing an irregular enhanced mass lesion.