title: Comparison of single and multiple sessions of percutaneous sclerotherapy for simple renal cyst.
abstract: OBJECTIVE
  To compare the results of single and repeated percutaneous sclerotherapy in patients with simple renal cysts.
  
  
  METHODS
  Eighty-two patients with simple renal cysts underwent needle aspiration andsclerotherapy under ultrasonographic guidance. Forty-two patients (group 1) underwent one session of sclerotherapy with 99% ethanol immediately after aspiration and 40 patients (group 2) underwent sclerotherapy at least twice. The patients were followed up using ultrasonography at 3-month intervals. The complete disappearance or a reduction of more than half in the diameter of the renal cyst was considered a successful treatment.
  
  
  RESULTS
  The mean diameter of the renal cysts was not significantly different in group 1 (6.12 cm) and 2 (6.75 cm). There was complete or partial regression in eight (19%) and 16 (38%) in group 1, and in 29 (73%) and nine (23%) in group 2, respectively. The overall success rate was significantly better in group 2 (95%) than in group 1 (57%; P < 0.001).
  
  
  CONCLUSIONS
  These results suggest that multiple sclerotherapy is better than a single injection of sclerosant for reducing the recurrence of simple renal cysts.
authors.affiliation: Department of Urology, Yonsei University College of Medicine, Seoul, Korea. chung646@yumc.yonsei.ac.kr
authors.forename: B H
authors.initials: BH
authors.lastname: Chung
authors.forename: J H
authors.initials: JH
authors.lastname: Kim
authors.forename: C H
authors.initials: CH
authors.lastname: Hong
authors.forename: S C
authors.initials: SC
authors.lastname: Yang
authors.forename: M S
authors.initials: MS
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D001707:Biopsy, Needle; D000431:Ethanol; D005500:Follow-Up Studies; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging; D052177:Kidney Diseases, Cystic / Q000000981:diagnostic imaging / Q000628:therapy*; D008875:Middle Aged; D015911:Sclerotherapy / Q000379:methods*; D012997:Solvents; D014463:Ultrasonography
chemical_list: D012997:Solvents; D000431:Ethanol