title: [Risk factors for intra- and postoperative complications in Wilms' tumor surgery].
abstract: BACKGROUND
  Wilms' tumor is the most common renal tumor in childhood. Preoperative treatment is still under discussion. The aim of this study was to determine, using our own patient collective, the risk factors for and type of intraoperative complications which can occur. In addition, the influence of the surgical procedure and tumor size on the complications and survival rate was analyzed.
  
  
  METHODS
  A total of 66 patients with Wilms' tumor were retrospectively analyzed. Evaluation included histology, size of the primary tumor as well as neoadjuvant and adjuvant chemotherapy. The total survival rate over periods of 5 and 10 years postoperatively were analysed using Kaplan-Meier survival probabilities.
  
  
  RESULTS
  All patients underwent radical nephrectomy: 63 using the transperitoneal and three the lumbar approach. The tumors had a mean size of 9.8 cm (range 2.5-20.0). Twenty patients (30.3%) received neoadjuvant chemotherapy for tumor reduction, while 46 patients underwent surgery without preoperative chemotherapy. Complications occurred in eight patients (15.2%). In two, a the tumor ruptured under surgery, four patients developed an ileus and two suffered cardiac arrest. One patient had postoperative hypertonia and another an incisional hernia. All complications occurred with a tumor size >5 cm or in the patient group without neoadjuvant chemotherapy. The 10 year survival rate was 89.4%.
  
  
  CONCLUSIONS
  The risk of complications is associated with the local size of the primary tumor. Through tumor reduction, neoadjuvant chemotherapy influences the expression of the such complications. Transperitoneal tumor nephrectomy is the method of choice in surgery for Wilms' tumors.
authors.affiliation: Urologische Klinik mit Poliklinik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Krankenhausstrasse 12, 91054, Erlangen, Deutschland. vahudin.zugor@uro.imed.uni-erlangen.de
authors.forename: V
authors.initials: V
authors.lastname: Zugor
authors.forename: D
authors.initials: D
authors.lastname: Krot
authors.forename: G E
authors.initials: GE
authors.lastname: Schott
mesh_terms: D004358:Drug Therapy / Q000401:mortality; D005260:Female; D006801:Humans; D007432:Intraoperative Period / Q000401:mortality*; D007680:Kidney Neoplasms / Q000188:drug therapy / Q000401:mortality* / Q000601:surgery*; D008297:Male; D009392:Nephrectomy / Q000401:mortality*; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D016019:Survival Analysis; D015996:Survival Rate; D016896:Treatment Outcome; D009396:Wilms Tumor / Q000188:drug therapy / Q000401:mortality* / Q000601:surgery*