title: Wilms tumor associated with polycythemia: case report and review of the literature.
abstract: OBJECTIVE
  A case of polycythemia with a normal serum erythropoietin is described, which led to the diagnosis of Wilms tumor. The clinical features of the reported cases of Wilms tumor associated with polycythemia are reviewed.
  
  
  RESULTS
  An asymptomatic 6-year-old boy with polycythemia, a normal serum erythropoietin, and no evidence of erythroid colony forming activity in his serum was found to have a Wilms tumor. After resection and chemotherapy, he has had no recurrence of either the polycythemia or the Wilms tumor. There have now been 10 cases of Wilms tumor reported: 7 patients were more than 16 years of age, 8 were boys, and 9 were clinical stage I with a favorable histology.
  
  
  CONCLUSIONS
  Polycythemia is a rare manifestation of Wilms tumor that can occur in the absence of an elevated serum erythropoietin and has an association with male gender, older patient age, and low clinical stage. Children with unexplained polycythemia should be investigated for Wilms tumor, even if the serum erythropoietin level is normal.
authors.affiliation: Department of Haematology and Oncology, Sydney Children's Hospital, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Lal
authors.forename: A
authors.initials: A
authors.lastname: Rice
authors.forename: M
authors.initials: M
authors.lastname: al Mahr
authors.forename: I B
authors.initials: IB
authors.lastname: Kern
authors.forename: G M
authors.initials: GM
authors.lastname: Marshall
mesh_terms: D002648:Child; D006801:Humans; D007680:Kidney Neoplasms / Q000150:complications*; D008297:Male; D011086:Polycythemia / Q000150:complications*; D009396:Wilms Tumor / Q000150:complications*