title: Efficacy of single-session percutaneous drainage and 50% acetic Acid sclerotherapy for treatment of simple renal cysts.
abstract: OBJECTIVE
  To evaluate the efficacy and long-term results of single-session 50% acetic acid sclerotherapy for the treatment of simple renal cysts, and to compare the therapeutic results of 5 and 20 min sclerosant dwell techniques.
  
  
  METHODS
  During the past 9 years, 50% acetic acid sclerotherapy was performed on 67 cysts in 66 patients. An acetic acid volume corresponding to a mean of 23% of the aspirated cyst volume was injected into the cysts. A 20 min dwell time with position changes was performed in 32 cysts (31 patients; group I) and 8% of volume for a 5 min dwell time in 35 cysts (35 patients; group II). Three- and 6-month sonographic or CT follow-up was performed for a minimum of 1 year. Complete regression was defined as no remaining cyst measurable on sonography with or without a scar at the renal cortex. Partial regression was defined as a decreased cyst volume compared with that before sclerotherapy. The Mann-Whitney U-test was used to compare the therapeutic results between the two groups.
  
  
  RESULTS
  For 67 simple renal cysts, complete regression on follow-up was observed in 21 of 32 cysts (66%; group I) and 22 of 35 cysts (63%; group II); the remaining 24 cysts all showed partial regression. The partial reduction rate of the cyst's volume was 97.4% (91.3-99.4%) in group I and 96.9% (90.8-99.5 %) in group II. There were no procedure-related major complications, and no statistically significant differences in the complete regression and partial volume reduction rates between the two groups (p > 0.05).
  
  
  CONCLUSIONS
  Fifty percent acetic acid is an effective and safe sclerosing agent for simple renal cysts. Fifty percent acetic acid sclerotherapy with a 5 min sclerosant dwell time, using a volume of about 10% of the aspirated volume, is sufficient for satisfactory results of simple renal cyst sclerotherapy.
authors.affiliation: Department of Diagnostic Radiology, Kyung Hee University Hospital, Hoeki-dong 1, Dongdaemun-gu, Seoul 130-702, Republic of Korea.
authors.forename: Se Hwan
authors.initials: SH
authors.lastname: Kwon
authors.forename: Joo Hyeong
authors.initials: JH
authors.lastname: Oh
authors.forename: Tae-Seok
authors.initials: TS
authors.lastname: Seo
authors.forename: Ho Chul
authors.initials: HC
authors.lastname: Park
mesh_terms: D019342:Acetic Acid / Q000008:administration & dosage*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media; D003952:Diagnostic Imaging; D004322:Drainage / Q000379:methods; D005260:Female; D006801:Humans; D007482:Iothalamate Meglumine; D052177:Kidney Diseases, Cystic / Q000175:diagnosis / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012597:Sclerosing Solutions / Q000008:administration & dosage*; D015911:Sclerotherapy / Q000379:methods*; D018709:Statistics, Nonparametric; D016896:Treatment Outcome
chemical_list: D003287:Contrast Media; D012597:Sclerosing Solutions; C001694:meglumine ioxithalamate; D019342:Acetic Acid; D007482:Iothalamate Meglumine