title: Use of miniature ultrasonic probe system for intravesical ultrasonography for transitional cell cancer of the urinary tract.
abstract: OBJECTIVE
  We describe the use of a miniature ultrasonic probe (MUP) system for intravesical ultrasonography for staging of urinary bladder and/or ureteral tumors.
  
  
  METHODS
  Seventeen patients with bladder tumors were enrolled in this study. Probes (8 F; 15 and 20 MHz) were inserted through a channel in a 22 F rigid cystoscopy sheath.
  
  
  RESULTS
  Using the MUP, each tumor could be scanned under simultaneous cystoscopic observation to choose the optimal probe position. However, in 4 of 17 patients optimal scanning could not be obtained because of large tumors and poor ultrasound penetration or because of tumor localization at the anterior dome which did not allow an appropriate scanning plane for staging. Of 13 evaluable patients, 5 with no interruption or folding of the low-echoic muscle layer were diagnosed as having a superficial tumor, and this was confirmed histopathologically in all but one case. All 8 cases evaluated as having invasive tumors demonstrated muscle invasion histologically.
  
  
  CONCLUSIONS
  The MUP can be more easily manipulated than a conventional probe.
authors.affiliation: Department of Urology, Niigata University School of Medicine, Japan. ytomita@med.niigata-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Tomita
authors.forename: K
authors.initials: K
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.forename: T
authors.initials: T
authors.lastname: Tanikawa
authors.forename: M
authors.initials: M
authors.lastname: Kimura
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002295:Carcinoma, Transitional Cell / Q000000981:diagnostic imaging*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014463:Ultrasonography / Q000295:instrumentation; D001749:Urinary Bladder Neoplasms / Q000000981:diagnostic imaging*