Clinical Features and Treatment of Simple Renal Cyst

Lee, Bong Ku; Lee, Nam Kyu; Park, Young Ho

Abstract

We analysed 3,130 patients with simple renal cyst who were discovered in 27,216 men receiving routine ultrasound examination in our hospital. Incidence of simple renal cyst was 11.5% in all populations and ratio of male to female was 1.8: 1. Patients age ranged from 14 to 91 years (average age 63.8 years) and number of renal cysts were increased after fifth decade in both sexes. Size of cysts were increasing along with age. And 201 cases visiting Urology Department were examined on symptoms. Symptoms associated with simple renal cysts were : none( 77.6% ), pain ( 11.4% ), gross hematuria( 4.0% ) and epigastric discomfort( 3.0% ). Benign renal cysts were treated with percutaneous aspiration in 9 cases, percutaneous aspiration with sclerosing agent in 13 cases and only follow-up in asymptomatic 29 cases. All were followed by ultrasound from 6 to 38 months(average 27 months). Overall efficacy were 44.4% with aspiration and 92.2 % with combined therapy. Sclerosing therapy using 99% ethanol seems to be a safe and effective way to prevent reaccumulation of cystic fluid in symptomatic cases. But routine follow-up is sufficient in asymptomatic cases, since simple renal cysts increase slowly in size.