title: Treatment of simple renal cysts with single-session percutaneous ethanol sclerotherapy without drainage of the sclerosing agent.
abstract: OBJECTIVE
  To evaluate percutaneous single-session sclerotherapy with ethanol without drainage of the sclerosing agent in symptomatic simple renal cysts that require treatment.
  
  
  METHODS
  A prospective series of 30 consecutive patients with symptomatic simple renal cysts with volume of 280.3 +/- 365.23 mL (range 28-1700 mL) estimated by ultrasonography were treated between July 1999 and July 2003. The cysts were punctured with an 18-gauge, 20-cm needle under ultrasound guidance and local anesthesia. A volume of ethanol equivalent to one third of the aspirated volume, up to a maximum of 100 mL, was injected into the cyst and left there. The patients were reassessed at 1, 3, and 6 months.
  
  
  RESULTS
  The procedure was technically feasible in all patients. The aspirated volume was 259.8 +/- 265.2 mL (range 30-1900 mL). After 1, 3, and 6 months, the average volume was 52.7 +/- 71.4 mL, 22.7 +/- 43.2 mL, and 11.6 +/- 30.7 mL, respectively. After this period, 28 patients (93%) were asymptomatic, showing total remission of the cyst (17 cases) or at least a 90% decrease (10 cases) or a 50% decrease (1 case) in the initial volume. One patient (3%) had a 50% reduction of the cyst and persistent symptoms, and one patient (3%) had persisting symptoms despite the total remission of the cyst.
  
  
  CONCLUSIONS
  Single-session percutaneous sclerotherapy with ethanol is a good option for the treatment of symptomatic renal cysts, as it is highly effective and offers the benefits of a less-invasive procedure.
authors.affiliation: Division of Urology, Clinical Hospital, Faculty of Medicine, University of São Paulo, Brazil. rfalcijr@clinck21.com.br
authors.forename: Renato
authors.initials: R
authors.lastname: Falci-Júnior
authors.forename: Antonio Marmo
authors.initials: AM
authors.lastname: Lucon
authors.forename: Luciana M Oliveira
authors.initials: LM
authors.lastname: Cerri
authors.forename: Alexandre
authors.initials: A
authors.lastname: Danilovic
authors.forename: Paula C Dias
authors.initials: PC
authors.lastname: Da Rocha
authors.forename: Sami
authors.initials: S
authors.lastname: Arap
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D000553:Ambulatory Care; D000431:Ethanol / Q000627:therapeutic use*; D005240:Feasibility Studies; D005260:Female; D021501:Flank Pain / Q000628:therapy; D006801:Humans; D015552:Injections, Intralesional; D052177:Kidney Diseases, Cystic / Q000000981:diagnostic imaging / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D012597:Sclerosing Solutions / Q000627:therapeutic use*; D015911:Sclerotherapy / Q000379:methods*; D016896:Treatment Outcome; D018608:Ultrasonography, Doppler
chemical_list: D012597:Sclerosing Solutions; D000431:Ethanol