title: Bilateral renal hemorrhage due to polyarteritis nodosa wrongly attributed to blunt trauma.
abstract: BACKGROUND
  A 36-year-old, previously healthy man presented to an accident and emergency department with right-sided abdominal pain 7 days after he sustained a trauma to his right flank. He was using no medication other than over-the-counter analgesics since his injury.
  
  
  METHODS
  Complete blood count, serum creatinine measurement, liver function tests, hepatitis B and C screening, abdominal CT, renal angiography, surgical exploration and histology of kidney samples.
  
  
  METHODS
  Polyarteritis nodosa with Page kidney causing bilateral perirenal hematoma, severe hypertension and renal failure.
  
  
  RESULTS
  The patient was severely anemic, and his bleeding was investigated. A 15 x 13 x 12 cm retroperitoneal hematoma was found in the region of the right kidney and the patient underwent unilateral right nephrectomy. 3 weeks after discharge the patient was readmitted with a left-sided perirenal hematoma. Steel-coil embolization of the kidney stopped the bleeding but the patient developed hypertension and renal failure, and antihypertensive agents and dialysis were started. Microaneurysms and vessel-wall necrosis were discovered on re-examination of the angiogram and histology, respectively, so immunosuppressive therapy was started, comprising intravenous methylprednisolone daily for 3 days and oral prednisolone and intravenous cyclophosphamide for 4 weeks. Page kidney, resulting from the bleeding into the solitary kidney, caused stretching of the renal artery and deterioration of renal function, which required hemodialysis treatment.
authors.affiliation: Renal Unit, St Luke's Hospital, Bradford, UK. ihabelmadhoun@hotmail.com
authors.forename: Ihab
authors.initials: I
authors.lastname: El Madhoun
authors.forename: Niall G
authors.initials: NG
authors.lastname: Warnock
authors.forename: Anu
authors.initials: A
authors.lastname: Roy
authors.forename: Colin H
authors.initials: CH
authors.lastname: Jones
mesh_terms: D000328:Adult; D003951:Diagnostic Errors; D006470:Hemorrhage / Q000209:etiology*; D006801:Humans; D007668:Kidney / Q000293:injuries; D007674:Kidney Diseases / Q000209:etiology*; D008297:Male; D010488:Polyarteritis Nodosa / Q000150:complications*; D014949:Wounds, Nonpenetrating / Q000150:complications / Q000175:diagnosis