title: Localized primary ureteral amyloidosis.
abstract: OBJECTIVE
  To analyze a new case of primary localized amyloidosis of the ureter, describing the differential diagnosis with ureteral tumors and its pathogenic mechanism.
  
  
  METHODS
  Description of the case of a male patient who presented clinical symptoms of renoureteral pain and hematuria and an image suspected of ureteral tumour undergoing laparoscopic nephroureterectomy. The pathological study confirmed amyloidosis of the ureter, AL by immunohistochemistry.
  
  
  RESULTS
  This report further extends the slightly more than 50 published cases of primary localized amyloidosis of the ureter the clinical signs of which, pain and haematuria, are similar, showing stenosis and enlargement in an area of the ureteral wall on imaging techniques. In the majority of cases the diagnosis was obtained postoperatively, being necessary to exclude generalized and secondary affectation.
  
  
  CONCLUSIONS
  Emphasis must be placed on the differential diagnosis of tumors of the ureter, especially in single-kidney patients, by using ureteroscopy and biopsy or preferably a careful cytological study. In our case a local inflammatory phenomenon could have been the basis of its pathogenesis.
authors: Urology Department, Hospital Txagorritxu, Vitoria, Alava, Spain. agareslo@telefonica.net
authors: A
authors: A
authors: García-Escudero López
authors: J
authors: J
authors: Padilla Nieva
authors: R
authors: R
authors: Infante Riaño
authors: J
authors: J
authors: Martín Bazaco
authors: A
authors: A
authors: Arruza Echevarría
authors: V
authors: V
authors: Moreno Nieto