title: Ureteropyeloscopy in the diagnosis of patients with upper tract hematuria: an initial clinical study.
abstract: BACKGROUND
  To study the usefulness and safety of ureteropyeloscopy in the diagnosis of upper tract hematuria of unknown etiology by standard diagnostic methods.
  
  
  METHODS
  Fifteen patients with upper tract hematuria of unknown etiology were the subjects of the present study. Prior to ureteropyeloscopy, they underwent standard diagnostic methods, including cystourethroscopy, excretory urography and computed tomography scan. The upper tract (ureter, renal pelvis and calyces) was inspected systematically with a flexible ureteropyeloscope under epidural anesthesia. A biopsy specimen was obtained when neoplasm of a suspicious lesion was seen. Bleeding and hemangiomatous lesions were fulgurated at the time of ureteropyeloscopy.
  
  
  RESULTS
  Unilateral gross hematuria was seen in 12 patients. Imaging studies revealed a filling defect in four patients, ureteral stenosis in one patient and nutcracker phenomenon in one patient. Urine cytology was positive in three patients and suspicious in four patients. Results of ureteropyeloscopy were papillary tumor in three patients, whitish encrustation in one patient, redness of the renal pelvis in one patient, bleeding from the renal calyx in two patients, hemangiomatous lesion in one patient, ureteral stenosis in two patients and no abnormalities in five patients. Biopsies were performed in five patients. The pathology results were transitional cell carcinoma in four patients and no abnormality in one patient. Although a ureteral stent catheter was placed in one patient, no serious complications were encountered during or after the procedures.
  
  
  CONCLUSIONS
  Ureteropyeloscopy was useful and relatively safe. This endoscopic examination can differentiate insignificant lesions from significant lesions by visual inspection of the lesions, in addition, pathological diagnosis by biopsy specimen can also be performed if deemed necessary. Ureteropyeloscopy is recommended in the diagnosis of upper tract hematuria of unknown etiology.
authors.affiliation: Department of Urology, Teikyo University School of Medicine, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yazaki
authors.forename: Y
authors.initials: Y
authors.lastname: Kamiyama
authors.forename: H
authors.initials: H
authors.lastname: Tomomasa
authors.forename: H
authors.initials: H
authors.lastname: Shimizu
authors.forename: Y
authors.initials: Y
authors.lastname: Okano
authors.forename: T
authors.initials: T
authors.lastname: Iiyama
authors.forename: T
authors.initials: T
authors.lastname: Iizumi
authors.forename: T
authors.initials: T
authors.lastname: Umeda
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D002295:Carcinoma, Transitional Cell / Q000150:complications / Q000175:diagnosis; D003558:Cystoscopy; D003937:Diagnosis, Differential; D005260:Female; D006391:Hemangioma / Q000150:complications / Q000175:diagnosis; D006417:Hematuria / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D007674:Kidney Diseases / Q000150:complications / Q000175:diagnosis*; D007680:Kidney Neoplasms / Q000150:complications / Q000175:diagnosis; D007682:Kidney Pelvis / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D014517:Ureteral Obstruction / Q000150:complications / Q000175:diagnosis; D018666:Ureteroscopy; D014567:Urography