title: Nephroid metaplasia of a graft kidney.
abstract: BACKGROUND
  Nephroid metaplasia is a benign and rare lesion that is confined to the lamina propria of the urinary tract. The leading cause of these lesions is previous trauma to the urothelium.
  
  
  METHODS
  We report a case of nephroid metaplasia of a graft kidney from a living-unrelated donor. This patient presented to our clinics due to painless gross hematuria 1 month after renal transplantation.
  
  
  RESULTS
  Although malignancy was suspected in the beginning due to a filling defect demonstrated by urography, only percutaneous excision of the tumor was performed to preserve the renal function. However, the pathological result disclosed nephroid metaplasia.
  
  
  CONCLUSIONS
  Hematuria warrant aggressive evaluation because underlying malignancy in a immunocompromised patient might be relatively progressive.
authors.affiliation: Department of Surgery, Taichung Veterans General Hospital, Taiwan, Republic of China.
authors.forename: K Y
authors.initials: KY
authors.lastname: Chiu
authors.forename: J T
authors.initials: JT
authors.lastname: Chen
authors.forename: S W
authors.initials: SW
authors.lastname: Hung
authors.forename: Y C
authors.initials: YC
authors.lastname: Ou
authors.forename: C R
authors.initials: CR
authors.lastname: Yang
mesh_terms: D002291:Carcinoma, Papillary / Q000175:diagnosis / Q000601:surgery; D005260:Female; D006801:Humans; D007668:Kidney / Q000000981:diagnostic imaging / Q000473:pathology*; D007680:Kidney Neoplasms / Q000175:diagnosis / Q000601:surgery; D016030:Kidney Transplantation; D008679:Metaplasia; D008875:Middle Aged; D011184:Postoperative Period; D014567:Urography