Management of upper urinary tract calculi with ureteroscopic techniques.

OBJECTIVES: To evaluate our experience in treating 155 patients with upper urinary tract calculi ureteroscopically. The treatment of urinary calculi has remained the most frequent application of ureteroscopy. Miniaturization of semirigid and flexible ureteroscopes has permitted easier access to calculi throughout the urinary tract. METHODS: Ureteroscopic stone treatment was attempted in 155 patients with upper urinary tract calculi between November 1995 and March 1997. Fifty-nine (38.1%) patients had renal calculi, 82 (52.9%) ureteral, and 14 (9%) had both renal and ureteral calculi. Both semirigid and flexible ureteroscopes were used for treatment (rigid alone in 21 [13.5%], flexible in 64 [41.3%], and both rigid and flexible in 70 [45.2%] patients). Lithotripsy was required in 122 (79%) of the patients. The holmium:yttrium-aluminum-garnet laser was used in 113 (92.6%) of these patients. RESULTS: All patients with ureteral calculi (29 proximal, 19 mid, and 34 distal) were successfully cleared after one endoscopic procedure except for 1 patient with a proximal ureteral calculus who had a 4-mm residual fragment in the kidney. Of the 59 patients with renal calculi, 47 (79.7%) were totally clear of stones 1 month after treatment. The remaining 12 (20.3%) patients had evidence of residual calculi 3 to 4 mm or less in diameter. In patients with combined renal and ureteral calculi, 1 1 of 14 (78.6%) were rendered stone free. The remaining 3 (21.4%) patients had evidence of residual calculi 4 mm in diameter. Overall, 95% of the patients were treated in an outpatient setting. Morbidity was low, with no evidence of stricture. CONCLUSIONS: Ureteroscopy and laser lithotripsy in experienced hands are a safe and reliable method for the treatment of ureteral and even intrarenal calculi.

Upper-tract transitional cell carcinoma.

Advances in ureteroscopic techniques have made it possible to treat many upper-tract tumors conservatively. Such treatment has demonstrated acceptable survival and renal preservation in high-risk patients, particularly those with a solitary kidney, bilateral tumors, poor renal function, or prohibitive operative risk. It is also preferred in patients with grade I TCC, particularly when located in the distal ureter. For patients with regionally extensive upper-tract urothelial neoplasms, use of endourologic techniques should be considered to control hemorrhage, relieve obstruction, and preserve as much functioning renal tissue as possible. Success with small, solitary, low-grade tumors allows the application of this technique to patients with a normal contralateral kidney on an elective basis. Adjuvant BCG or mitomycin C therapy appears to be safe, but confirmation of any benefits awaits the results of larger trials. Benign neoplasms can occur in the upper urinary tract and should be distinguished from TCC, thus avoiding more radical treatment for a benign lesion. Endoscopic surveillance should be maintained because recurrences can develop without radiographic evidence.

Ureteroscopic biopsy: technique and specimen preparation.

Because tissue samples obtained ureteroscopically are small, the techniques for biopsy and for handling and processing the samples are crucial. Our aim is to describe the biopsy technique in great detail so other centers can reproduce it. Patients were evaluated by retrograde ureteropyelography and ureteroscopy for diagnosis. The entire collecting system was examined using a combination of small-diameter rigid and flexible ureteroscopes. Samples were retrieved by aspiration, saline lavage, or, when possible, biopsy of visible tumor by a basket or cup forceps. Multiple samples were obtained from all patients. Fresh specimens were hand delivered to the cytopathology laboratory, where they were evaluated with the cytospin technique. A cell block was prepared whenever there was any visible tissue in the sample. Since we have practiced this technique of handling specimens, our ability to diagnose and grade upper tract neoplasms ureteroscopically has improved markedly. Use of this technique can improve the diagnostic accuracy of ureteroscopic biopsy.

Grading of upper urinary tract transitional cell carcinoma by computed DNA content and p53 expression.

OBJECTIVES: Transitional cell carcinomas of upper urinary tract (uttTCC) constitute 5% to 6% of all urothelial tumors. Ureteropyeloscopy has become the standard for clinical evaluation of uutTCC. Moreover, endoscopic treatments have been advocated as a conservative approach for low grade tumors or patients with intermediate grade tumors whose renal function is compromised. Therefore, grading has become the most predictive variable in defining therapeutic approach. In addition to morphologic evaluation, a series of biologic markers may be used to increase the accuracy of grading such as DNA analysis and p53 protein expression. In this study, we have evaluated these markers by means of cell image analysis with the SAMBA 400 system. METHODS: Thirteen cases of uttTCC were studied with cytologic smear, cell block, and histologic confirmation. DNA analysis was performed on cytologic smear. Immunostaining was performed on cell blocks. A grade was assigned on the basis of DNA evaluation and p53 expression quantitation. These grades were combined for each case and compared with the initial cytologic grading and the final histologic grading. RESULTS: Cytology alone diagnosed TCC in all but 1 case that was diagnosed atypical. Discrepancies were found in primary grading: cytologic grading concurred with histologic grading in 6 of the 13 cases. CONCLUSIONS: These results, although in a limited but selected number of cases, show the potential of computerized evaluation of biologic markers as parameters for a more objective grading of tumors.

Initial use of Browne Pneumatic Impactor.

To determine the safety and effectiveness of the Browne Pneumatic Impactor (BPI), a new pneumatic mechanical lithotripter, in fragmenting urinary calculi. Nine patients were treated between November 1995 and March 1996. The calculi were located in the bladder and urethra in one case, the bladder alone in one case, the distal ureter in six cases, and the proximal ureter in one case. The device was used through semirigid and actively deflectable, flexible fiberoptic endoscopes. All patients were treated on an outpatient basis. Fragmentation of the urinary calculi was successful in all patients when the stone could be reached endoscopically. The device worked irrespective of stone size or composition. There were no intraoperative or long-term complications directly related to the use of the device. All treated patients were stone free at 1-month follow-up, with no evidence of ureteral obstruction. The results of our initial study show that the BPI is a simple, safe, and reliable intracorporeal lithotripter, able to fragment the hardest urinary calculi through semirigid and actively deflectable, flexible fiberoptic endoscopes with no complications related to use of the device.

Ureteroscopic evaluation and treatment of chronic unilateral hematuria.

PURPOSE: Chronic unilateral hematuria constitutes a difficult problem of diagnosis and treatment. We evaluated 23 patients with unilateral renal hematuria to determine the cause of bleeding and to evaluate ureteroscopic treatment. MATERIALS AND METHODS: A total of 23 patients with chronic unilateral hematuria were evaluated ureteroscopically during a 2-year period. Semirigid and flexible ureteroscopes were used to evaluate all patients. Dilation of the ureterovesical junction was required in only 1 patient. RESULTS: The entire ureter and intrarenal collecting system were inspected in all patients. Discrete lesions comprised hemangioma in 7, minute venous rupture in 3, small papillary tumor in 3 and calculus in 2 patients which were treated successfully. Nonspecific lesions comprised submucosal erythema in 2 patients and abnormal papillary tip in 1 which were treated successfully as well. In the remaining 5 patients no lesions were detected. In all treated patients hematuria resolved with no recurrence during a mean followup of 8 months (range 4 to 18). CONCLUSIONS: Ureteroscopy is an important diagnostic and therapeutic procedure for patients with chronic unilateral hematuria.

Ureteroscopic treatment of ureteropelvic junction obstruction.

PURPOSE: Endopyelotomy has increasingly become well accepted as the optimal management for primary and secondary ureteropelvic junction obstruction. We report our experience with ureteroscopic endopyelotomy guided by endoluminal ultrasound. MATERIALS AND METHODS: Ureteroscopic endopyelotomy was attempted in 27 patients with primary and 10 with secondary ureteropelvic junction obstruction. Retrograde pyelogram and endoluminal ultrasound were performed at the start of the procedure in all patients. Based on sonographic findings 5 patients were not considered candidates for the procedure. The remaining 13 men and 19 women were treated ureteroscopically with a rigid ureteroscope in 5 (15.6%), flexible in 20 (62.5%), and rigid and flexible in 7 (21.9%) patients. Stents were placed postoperatively for 6 to 10 weeks. The patients were followed for a mean duration of 10 months. RESULTS: The procedure was completed in all patients. Average operating time was 95 minutes including the time for imaging. Sonographic localization guided the site of incision in all patients and changed therapy in 5. It identified crossing vessels in 10 patients (31%), septum denoting high insertion in 5 (15.5%) and both in 7 (22%). Preoperative stenting was not required in any patient. Morbidity was low with no patients requiring transfusion and no evidence of ureteral strictures. Success, defined as pain-free with resolution of obstruction on diuretic renal scan, was achieved in 28 of the 32 patients (87.5%). CONCLUSIONS: Ureteroscopic endopyelotomy is a safe and effective treatment for most cases of ureteropelvic junction obstruction. Endoluminal ultrasonography of the obstructed ureteropelvic junction has gained a major role in defining which patient to treat and in directing endoluminal incisions to minimize the risk of injury to adjacent vessels. There is a higher failure rate when vessels are present.