[Necrotizing vasculitis located exclusively in the bladder: report of a case].

Necrosing vasculitis and, within it, nodosa polyarteritis, is an infrequent entity characterized by the absence of pathognomonic signs and symptoms, but which can potentially affect the entire body. The initial description was made by Kussmaul and Maier in 1866. Sings and symptoms of this clinical picture are not frequently circumscribed to the urinary tract. We describe here one case of a particularly infrequent presentation, as a vesical mass with gross haematuria. The paper discusses the clinical picture, diagnosis and treatment of this process.