title: [Shape-memory alloy net-like stent for the management of ureteral stricture: a long-term follow-up report].
abstract: OBJECTIVE
  To investigate the long-term outcome of treatment of ureteral stricture with shape-memory alloy net-like stent.
  
  
  METHODS
  Nickel-titanium shape-memory alloy net-like stent was used to treat 9 patients with ureteral stricture, 4 males and 5 females, aged 41 (29-63), with the length of ureteral stricture of 1.0-4.0 cm, the etiology being radical operation for rectal carcinoma in 2 cases, chronic inflammation in 3 case, and operation for benign diseases in 4 cases. A total of 10 stents were inserted under spinal anesthesia. The mean follow-up time was 27.2 months (5-96 months).
  
  
  RESULTS
  Ureteral obstruction was relieved in 7 cases (77.8%) with the relief or disappearance of hydronephrosis. The ureteral stents were blocked and re-obstruction appeared in 2 cases within 5-6 months due to hyperplasia of fibrous tissue. One of the cases underwent removal of stent and the other case underwent insertion of double-J with improvement of renal function. No radiological evidence of migration of stent and encrustation was found.
  
  
  CONCLUSIONS
  More tolerable and with less side-effect and lower re-stricture rate, shape-memory alloy stent is better then Double-J in treatment of ureteral obstruction.
authors.affiliation: Institute of Urology, First Hospital of Peking University, Beijing 100034, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Song
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Yan-qun
authors.initials: YQ
authors.lastname: Na
mesh_terms: D000328:Adult; D002858:Chromium Alloys; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D016896:Treatment Outcome; D014517:Ureteral Obstruction / Q000601:surgery*
chemical_list: D002858:Chromium Alloys