title: Embryonal adenoma of the kidney associated with polycythemia and von Willebrand disease.
abstract: OBJECTIVE
  We studied the significance, identification and management of acquired von Willebrand disease and polycythemia associated with benign renal tumors in children.
  
  
  METHODS
  Two patients who presented with polycythemia and a renal mass were also found to have acquired von Willebrand disease. One patient was treated with radical nephrectomy and 1 was treated with partial nephrectomy. The patients have been followed for 19 and 10 months, respectively.
  
  
  RESULTS
  Excision of the renal mass resulted in prompt resolution of polycythemia and von Willebrand disease in each patient. Perioperatively 1-deamino-(8-D-arginine)-vasopressin was given to control bleeding. Each patient had benign embryonal adenoma of the kidney.
  
  
  CONCLUSIONS
  Polycythemia and von Willebrand disease may be associated with benign kidney neoplasms. Children and adolescents with a renal mass may benefit from preoperative screening for coagulopathy.
authors.affiliation: Department of Pediatric Urology, Children's Hospital of Pittsburgh, Pennsylvania, USA.
authors.forename: B R
authors.initials: BR
authors.lastname: Konety
authors.forename: J D
authors.initials: JD
authors.lastname: Hord
authors.forename: E S
authors.initials: ES
authors.lastname: Weiner
authors.forename: F X
authors.initials: FX
authors.lastname: Schneck
mesh_terms: D000236:Adenoma / Q000150:complications* / Q000473:pathology; D002648:Child; D006801:Humans; D007680:Kidney Neoplasms / Q000150:complications* / Q000473:pathology; D008297:Male; D011086:Polycythemia / Q000150:complications*; D014842:von Willebrand Diseases / Q000150:complications*