[Spontaneous perirenal hemorrhage in patients with polyarteritis nodosa].

Polyarteritis nodosa is a necrotising vasculitis of small and medium-sized arteries. All coats of these vessels are involved easily resulting in aneurysm formations. It is an immunologic disease owing to immune complexes deposits. Kidney affection is over 80%. Polyarteritis nodosa may be complicated by perirenal hematoma, hemobilia, intrahepatic hemorrhage, epidural hematoma. Spontaneous perirenal hematoma can be the initial manifestation of this disease. Abdominal ultrasonography can provide a quick diagnosis of complicating disease and embolization by interventional radiology may be considered a therapeutic alternative to surgery.