title: The prevalence of malignancy in satellite renal lesions and its surgical implication during nephron sparing surgery.
abstract: OBJECTIVE
  We examined the prevalence of malignancy in a synchronous ipsilateral renal lesion identified during partial nephrectomy and evaluated its clinical significance.
  
  
  METHODS
  We retrospectively reviewed the records of 112 patients (114 renal units) who underwent nephron sparing surgery for a clinically localized sporadic renal mass between May 1995 and September 2005.
  
  
  RESULTS
  In 37 patients (32%) an additional lesion was diagnosed and excised intraoperatively, while in 67% these lesions were known before the operation and believed to be simple cysts. During surgery the additional mass was suspicious in 8 cases and in the remainder the mass was described as simple cysts that were excised. The mean size of the primary mass was 3.1 cm (SD 1.4). In 29 (78%) cases the primary mass was malignant, in 23 (79%) of these the second mass was benign and in the remainder renal cell carcinoma was diagnosed. In 8 cases (22%) the primary mass was benign and in 2 (25%) the secondary mass was malignant. Overall 22% of all second masses were malignant, and all were low grade and low stage. We found that 7% of second ipsilateral masses could be expected to harbor malignancy.
  
  
  CONCLUSIONS
  Based on our data it is questionable whether total nephrectomy is mandatory as an immediate response to an ipsilateral synchronous second renal mass. The present findings may represent an increased appreciation of ipsilateral multicentricity compared to historical data.
authors.affiliation: Department of Urology, Assaf Harofeh Medical Center, Zerifin, Israel. droritraz@yahoo.com
authors.forename: Orit
authors.initials: O
authors.lastname: Raz
authors.forename: Sonia
authors.initials: S
authors.lastname: Mendlovic
authors.forename: Dan
authors.initials: D
authors.lastname: Leibovici
authors.forename: Allan J
authors.initials: AJ
authors.lastname: Pantuck
authors.forename: Judith
authors.initials: J
authors.lastname: Sandbank
authors.forename: Avishay
authors.initials: A
authors.lastname: Sella
authors.forename: Arie
authors.initials: A
authors.lastname: Lindner
authors.forename: Amnon
authors.initials: A
authors.lastname: Zisman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002292:Carcinoma, Renal Cell / Q000175:diagnosis / Q000453:epidemiology / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D009367:Neoplasm Staging; D009392:Nephrectomy / Q000379:methods*; D015995:Prevalence; D011379:Prognosis; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014463:Ultrasonography