title: [Therapeutic strategy of Bosniak category II renal cyst: a report of 52 cases].
abstract: OBJECTIVE
  To evaluate the therapeutic strategy of Bosniak category II renal cyst.
  
  
  METHODS
  A total of 52 cases of Bosniak category II renal cyst underwent surgery from 2004 to 2011. There were 32 males and 20 females with a mean age of 48 years. Their average diameter of renal cysts was 4.7 cm. There were 25 left, 23 right and 4 bilateral lesions.
  
  
  RESULTS
  Renal cystectomy (n = 47) and radical nephrectomy (n = 5) were performed. Four cases of renal cyst with cystectomy had malignancy confirmed with intraoperative frozen section and underwent radical nephrectomy immediately. One case underwent radical nephrectomy in second stage because of a confirmation of malignant renal cyst after cystectomy. Malignant renal cyst were found in 5 cases and benign lesions in 47. The malignancy rate was 9.6% (5/52) with 14.3% (4/28) in IIF group and 4.2% (1/24) in non-IIF group. Forty-three cases were followed up for 1-8 years with 4 cases of malignancy and 39 cases of benign lesions. One case of malignancy had pulmonary metastasis at 3 years post-operation.
  
  
  CONCLUSIONS
  Operation should be performed in IIF renal cyst and II cyst with a diameter of >5 cm. Follow-ups should be performed in other category II renal cysts, especially in young patients.
authors.affiliation: Department of Urology, Hangzhou Red Cross Hospital, Hangzhou 310003, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Mei
authors.forename: Yong
authors.initials: Y
authors.lastname: Qin
authors.forename: Hai
authors.initials: H
authors.lastname: Gu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Hang
authors.initials: H
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D052177:Kidney Diseases, Cystic / Q000145:classification / Q000601:surgery*; D007680:Kidney Neoplasms / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D055815:Young Adult