Evaluation of renovated double J stents using ureter models with and without stenosis.

PURPOSE: Commercial double J stents (DJS) have a uniform shape regardless of the specific nature of various ureteral diseases. We tested renovated DJS and compared them with conventional DJS using ureter models. METHODS: One straight ureter model included stenosis at the distal ureter near the ureterovesical junction and the other did not. We used conventional DJS and renovated 5- and 6-Fr soft DJS for ureter stones and 6-, 7-, and 8.5-Fr hard DJS for tumors. The DJS comprised holes in the upper, middle, or lower one-third of the shaft (length, 24 cm; 2-cm-diameter coils at both ends). More holes were created along the shaft based on the ureteral disease location. Conventional DJS had holes spaced 1 cm apart along the shaft. Renovated DJS had holes spaced 1 cm apart along the shaft with 0.5-cm intervals on the upper, middle, or lower one-third of the shaft. Urine flow was evaluated. RESULTS: As the DJS diameter increased, the flow rate decreased. The flow rates of DJS with holes in the lower shaft were relatively lower than those of conventional DJS and DJS with holes in the upper and middle shafts. In the ureter model without stenosis, 6-, 7-, and 8.5-Fr renovated stents exhibited significantly higher flow rates than conventional stents. In the ureter model with stenosis, 5-, 6-, 7-, and 8.5-Fr renovated stents did not exhibit significantly higher flow rates than conventional stents. CONCLUSION: Renovated stents and conventional stents did not exhibit significant differences in urine flow with stenosis.

A modified triangular Double-J stent for retrograde intrarenal surgery improvement of free-stone rate, and quality of life: a randomized controlled, multiple centers, perspective trial.

PURPOSE: The goal of this study is to evaluate the efficacy and safety of modified triangular double-J (DJ) stent in 1-2 cm renal or ureter calculi after retrograde intrarenal surgery (RIRS) via a randomized, controlled clinical study. METHODS: A total of 196 patients with 1-2 cm renal or ureter calculi who were performed RIRS and received 7Fr modified triangular DJ stents (100 cases) or 6Fr normal DJ stents (96 cases). All operations were performed by experienced surgeons. The clinical characteristics and outcomes were analyzed. RESULTS: There were no significant differences between two groups in terms of age, gender, BMI, location, hydronephrosis, urea WBC, urea RBC, BUN, Cr, laser emission time, operation time, Hb loss, postoperative BUN, postoperative Cr. Patients who received modified triangular DJ stents were shown to have higher stone-free rate (p = 0.038), but lower general health (p = 0.004). CONCLUSION: The modified triangular 7Fr DJ stents were more efficient for patients underwent RIRS than 6Fr normal DJ stents.

Obstructive struvite ureterolithiasis in 4-month-old intact male Bernese mountain dog.

A 4-month-old, 7 kg, intact male, Bernese mountain dog was presented for obstructive struvite ureterolithiasis. Multiple urethroliths, ureteroliths, and urocystoliths were present. Based on an abdominal ultrasound, there was severe left hydronephrosis and hydroureter from distal ureterolith obstruction, just proximal to the vesicoureteral junction. The dog was not azotemic. Successful treatment was accomplished via ventral cystotomy. Bladder wall culture revealed a methicillin-resistant Staphylococcus spp. No predisposing cause was identified. There are no known genetic predispositions in Bernese mountain dogs for struvite urolithiasis. The urinary tract infection resolved with surgical retrieval of the uroliths and antibiotic treatment. The dog remained clinically normal after the cystotomy but developed a subclinical urinary tract infection 4 mo post-operatively. Key clinical message: Urolithiasis is rare in pediatric veterinary patients. To the authors' knowledge, this is the first report of obstructive ureterolithiasis in a puppy. There is no known genetic predisposition for urolithiasis in Bernese mountain dogs.

Urétérolithiase obstructive à struvite chez un bouvier bernois mâle intact de 4 mois. Un bouvier bernois mâle intact de 4 mois, pesant 7 kg, a été présenté pour une urétérolithiase obstructive à struvite. De multiples urétrolithes, urétérolithes et urocystolithes étaient présents. Sur la base d'une échographie abdominale, il y avait une hydronéphrose gauche sévêre et un hydro-uretêre dû à une obstruction distale de l'urétérolithe, juste en amont de la jonction vésico-urétérale. Le chien n'était pas azotémique. Le succês du traitement a été obtenu par cystotomie ventrale. La culture de la paroi vésicale a révélé un Staphylococcus spp. résistant à la méticilline. Aucune cause prédisposante n'a été identifiée. Il n'y a pas de prédisposition génétique connue chez les bouviers bernois pour la lithiase urinaire à struvite. L'infection des voies urinaires s'est résolue avec l'extraction chirurgicale des urolithes et un traitement antibiotique. Le chien est resté cliniquement normal aprês la cystotomie mais a développé une infection subclinique des voies urinaires 4 mois aprês l'opération.Message clinique clé:La lithiase urinaire est rare chez les patients vétérinaires pédiatriques. À la connaissance des auteurs, il s'agit du premier rapport d'urétérolithiase obstructive chez un chiot. Il n'y a pas de prédisposition génétique connue pour la lithiase urinaire chez les bouviers bernois.(Traduit par Dr Serge Messier).

[The tale of two stones in an obstructed partial duplex kidney: case presentation].

Duplex renal systems is a common anomalies. Incidence rate of 0.8% in healthy adult population and 2-4% in patients investigated for urinary tract symptoms. Urolithiasis management for patients with anomalies is complex and require proper imaging and planning. We have a patient with a partial duplex collecting system presented with a right renal calculus in a non-functioning lower moiety and multiple distal ureteric calculi. Preoperative planning done and surgery performed with good outcome without any early and late complications.

Comparison of the effects of retroperitoneoscopic ureterolithotomy and ureteroscopic lithotripsy in the treatment of upper ureteral calculi.

ABSTRACT: This study compares the efficacy of retroperitoneoscopic ureterolithotomy (RPUL) and ureteroscopic lithotripsy (URL) in the treatment of upper ureteral calculi.The clinical data of 150 patients with upper ureteral calculi who underwent RPUL and 136 patients who underwent URL between January 2014 and October 2019 were retrospectively analyzed. The operation time, postoperative hospital stay, operation success rate, stone clearance rate, and surgical complications were evaluated between the two groups.For the RPUL and URL groups, respectively, the average operation time was 74.5 ±â€Š24.6 minutes and 54.5 ±â€Š13.2 minutes; the postoperative hospital stay was 5.8 ±â€Š1.4 days and 3.2 ±â€Š1.2 days; the operation success rate was 96.0% (144/150) and 85.3% (116/136); the incidence rate of complications was 3.5% (5/144) and 17.5% (18/103); and the stone clearance rate was 100% (144/144) and 88.8% (103/116), which were all statistically significant (P < .05).Both RPUL and URL had the advantages of low trauma and fast recovery rate for patients with upper ureteral calculi. However, patients who underwent RPUL showed higher success and fewer complication rate. RPUL might be a safe and effective laparoscopic method for the treatment of patients with upper ureteral calculi.

Risk factors and clinical relevance of positive urine cultures in cats with subcutaneous ureteral bypass.

BACKGROUND: The objective of the study was to report the incidence and risk factors associated with positive urine bacterial cultures as well as long-term outcome in cats with subcutaneous ureteral bypass (SUB) devices. RESULTS: Medical records of cats that underwent SUB device placement were retrospectively reviewed. Signalment of the cat, laterality of the ureteral obstruction, surgery, anesthesia and hospitalization duration, bacterial culture results and follow-up data were retrieved. Thirty-two cats met the inclusion criteria. Four cats (12.5%) had a positive intraoperative culture, with two of them being treated successfully. Ten cats out of 28 (35.7%) were documented with a positive urine culture during follow-up period, with a median time between discharge and identification of the first positive urine culture of 159 days (range 8-703 days). Bacteriuria resolved in 60% of cats (6/10). Escherichia coli was the most common organism, isolated in 4 out of 10 postoperative urine cultures. Overall, subclinical bacteriura was documented for 6 of 32 (18.8%) cats and 5 of 32 (15.6%) cats displayed clinicals signs suggestive of persistent UTI. One cat had subclinical bacteriuria. Three cats died during the follow-up period. There was a significant difference between negative and positive urine bacterial culture groups in median hospitalization duration (5 days versus 6 days, P = 0.022) and in median body condition score (5/9 versus 4/9, P = 0.03). Cats with a longer hospital stay and with a lower body condition score were more likely to have a positive urine culture during follow-up period. CONCLUSIONS: SUB device placement surgery is associated with complications such as chronic bacteriuria. Bacteriuria in our study resolved with appropriate antibiotic treatment in more than half of cats. Risk factors identified for positive urine culture were a longer hospitalization duration and a decreased body condition score.

Low Urologist Density Predicts High-Cost Surgical Treatment of Stone Disease.

Introduction and Objectives: Lack of access to urologic specialists is approaching crisis levels as the number of urologists is decreasing, while the demand for urologic care is increasing. The financial implications of this have not been explored. The objective of this study is to examine the impact of access and other patient factors on cost to treat urolithiasis. We hypothesized that markers of poor access would associate with higher costs of surgical encounters for patients presenting with urolithiasis. Methods: A retrospective review of prospectively collected data from the Registry for Stones of the Kidney and Ureter (ReSKU) from September 2015 to July 2018 was conducted to investigate characteristics of surgical patients treated for urinary stone disease. Univariate analysis was performed using the Welch two-sample t-test. Multivariate analysis was performed using logistic regression. Statistical analysis was performed in R version 3.5. Results: When taking into account age, delayed presentation, procedure type, stone size >20 mm, American Society of Anesthesiologists (ASA) code, gender, race, income, distance, urologist density, body mass index, diabetes, infection, education, language, insurance, and stone complexity, patients undergoing percutaneous nephrolithotomy procedure (p < 0.001; odds ratio [OR] 12.9, confidence interval [CI] 4.05-48.5), urologist density in the bottom quartile (p = 0.014; OR 4.66, CI 1.40-16.9), diabetes (p = 0.018; OR 4.38, CI 1.32-15.6), and infection (p = 0.007; OR 4.51, CI 1.55-14.0) were the only variables statistically significant for association with top quartile of total cost. Conclusions: Surgical encounter costs are largely dictated by patient clinical factors, but low regional urologist density appears to independently predicted for high-cost stone surgery. Increasing patients' access to a urologist may prove to be financially beneficial in the longitudinal reduction in health care costs for stone disease.

Renal pelvic rupture, intrapelvic haematoma and retroperitoneal haemorrhage associated with obstructive ureterolithiasis in a cat.

A neutered female cat presented with a 9-day history of hyporexia and depression. The referring veterinarian had identified moderate non-regenerative anaemia, haematuria and suspected unilateral obstructive ureterolithiasis. Subsequent ultrasonography revealed moderate distension of the left renal pelvis with echogenic material, ureteral distension and ureterolithiasis. A partial ureteral obstruction was suspected. After 4 days of medical management, there was further distension of the renal pelvis with well-delineated echogenic material and an accumulation of perinephric fluid. A left nephroureterectomy was performed. Renal pelvic rupture with intrapelvic haematoma and retroperitoneal haemorrhage was confirmed by histopathology. Eighteen months following surgery, the cat remained clinically well with normal renal values.

Ureteral Stent Encrustation: Epidemiology, Pathophysiology, Management and Current Technology.

PURPOSE: Encrustation is a common phenomenon that can occur following placement of a ureteral stent into the urinary tract, and it can lead to serious complications. The following review addresses the mechanism of encrustation, the management of these stents and the newest technology developed to mitigate this issue. MATERIALS AND METHODS: We performed a comprehensive literature search on stent encrustation including peer-reviewed publications, public product listings, and material on current and future stent technology. RESULTS: The mechanism of encrustation is complex and multifaceted, including dwell time, patient specific risk factors, conditioning film formation, biofilm formation and mineral deposition. Several technological developments in stent materials and coatings may have a role in reducing the risk of stent encrustation. It is important to identify the extent of stent encrustation and plan treatment strategies accordingly. We propose a novel treatment algorithm for the management encrusted ureteral stents. CONCLUSIONS: The ubiquity of ureteral stents in urology practice mandates updated knowledge about the prevention of stent encrustation, identification of high risk patients and preparedness for removal using multimodal techniques.

Placement of ureteral stents in three rabbits for the treatment of obstructive ureterolithiasis.

Management of ureteral obstruction with stenting is often associated with a lower rate of complications than ureterotomy in domestic carnivores, but this treatment has not been previously evaluated in rabbits. Three rabbits (7, 6 and 10 years old) were diagnosed with unilateral obstructive ureterolithiasis associated with hydronephrosis and hydroureter on abdominal ultrasound. Decreased overall renal function was confirmed in all three cases. Ureteral stents were placed retrogradely via cystotomy without complication in two cases and anterogradely via nephrostomy in the third case. Survival after stent placement was 30, 3 and 8 months, with encrustation of the stent and re-obstruction occurring 18, 1 and 6 months after stent placement in successive cases. Ureteral stenting can be considered for short-term management of ureterolithiasis in rabbits to improve renal function and maintain quality of life. Ultrasound or radiographic monitoring is recommended to detect encrustation of the stent. Studies comparing ureteral stenting to ureterotomy in rabbits are needed to determine the effectiveness of these techniques.

Shared Decision Making in Patients With Suspected Uncomplicated Ureterolithiasis: A Decision Aid Development Study.

OBJECTIVE: The objective was to develop a decision aid (DA) to facilitate shared decision making (SDM) around whether to obtain computed tomography (CT) imaging in patients presenting to the emergency department (ED) with suspected uncomplicated ureterolithiasis. METHODS: We used evidence-based DA development methods, including qualitative methods and iterative stakeholder engagement, to develop and refine a DA. Guided by the Ottawa Decision Support Framework, International Patient Decision Aid Standards (IPDAS), and a steering committee made up of stakeholders, we conducted interviews and focus groups with a purposive sample of patients, community members, emergency clinicians, and other stakeholders. We used an iterative process to code the transcripts and identify themes. We beta-tested the DA with patient-clinician dyads facing the decision in real time. RESULTS: From August 2018 to August 2019, we engaged 102 participants in the design and iterative refinement of a DA focused on diagnostic options for patients with suspected ureterolithiasis. Forty-six were ED patients, community members, or patients with ureterolithiasis, and the remaining were emergency clinicians (doctors, residents, advanced practitioners), researchers, urologists, nurses, or other physicians. Patients and clinicians identified several key decisional needs including an understanding of accuracy, uncertainty, radiation exposure/cancer risk, and clear return precautions. Patients and community members identified facilitators to SDM, such as a checklist of signs and symptoms. Many stakeholders, including both patients and ED clinicians, expressed a strong pro-CT bias. A six-page DA was developed, iteratively refined, and beta-tested. CONCLUSIONS: Using stakeholder engagement and qualitative inquiry, we developed an evidence-based DA to facilitate SDM around the question of CT scan utilization in patients with suspected uncomplicated ureterolithiasis. Future research will test the efficacy of the DA in facilitating SDM.

Valor predictivo de proteína C reactiva y albúmina en la expulsión de litos ureterales de 6-10 mm del tercio inferior / Predictive Value of C-reactive Protein and Albumin in the Expulsion of Ureteral Stones (6-10 mm) from the Lower Third

Introducción La litiasis ureteral es responsable del 20% de casos de urolitiasis, el cólico renal afecta negativamente la calidad de vida, el mayor dilema es el elegir entre medidas conservadoras y cirugía. La mayoría de los litos ureterales de tercio distal menor de 6mm, pueden pasar espontáneamente con terapia conservadora. Sin embargo, ella se asocia a incomodidad, infecciones y ausencia laboral. La proteína C Reactiva (PCR) se ha utilizado como predictor en la expulsión de esos litos, además se introduce el uso de la albúmina como nuevo marcador de predicción. Objetivo El objetivo es analizar el valor predictivo de PCR y albúmina para la expulsión de litos ureterales de tercio inferior de 6­10 mm. Métodos Se realizó un estudio prospectivo en pacientes que presentaron cólico renal secundario a litiasis ureteral distal 6­10 Mm, los cuales recibieron tratamiento médico expulsivo durante 4 semanas, hasta la expulsión del lito o la necesidad de tratamiento quirúrgico en que se determinó punto de corte de PCR y albúmina por medio de una curva COR. Resultados 78 pacientes se enrolaron en el estudio, el paso espontáneo fue de 55,1% y el restante requirió de intervención quirúrgica, el punto de corte para PCR fue 5,95 mg/L y de 2,75 g/dl para albúmina. Conclusión El PCR es un parámetro predictivo en la expulsión de litos ureterales de tercio inferior en pacientes muy seleccionados. Se obtiene el siguiente punto de corte para predecir la eliminación del lito (5,95 mg/L) y se propone la albúmina como un nuevo parámetro bioquímico.

Introduction Ureteral stones is responsible for 20% of cases of urolithiasis, renal colic negatively affects quality of life, the main dilemma is choosing between conservative measures and surgery. Most ureteral stones of the distal third smaller than 6 mm can pass spontaneously with conservative therapy. However, this is associated with discomfort, infections. C Reactive protein (CRP) has been used as a predictor in the expulsion of these stones, and the use of albumin as a new marker of prediction is also introduced. Objective The objective is to analyze the predictive value of CRP and albumin for the expulsion of ureteral stones of the lower third of 6­10 mm Methods A prospective study was performed in patients who presented renal colic secondary to distal ureteral lithiasis 6­10 mm and who received medical expulsive treatment for 4 weeks, until the expulsion of the stone or the need for surgical treatment, PCR cut off point was determined and albumin by means of a ROC curve. Results 78 patients enrolled in the study, spontaneous passage was 55.1% and the remaining required surgical intervention, the cut-off point for PCR was 5.95 mg/L and 2.75 g/dl for albumin. Conclusion CRP is a predictive parameter in the expulsion of lower third ureteral stones in highly selected patients. The following cut off point is obtained to predict the elimination of lithium (5.95 mg/L) and albumin is proposed as a new biochemical parameter.

The Impact of Stone Multiplicity on Surgical Decisions for Patients with Large Stone Burden: Results from ReSKU.

Introduction: American Urological Association (AUA) guidelines recommend percutaneous nephrolithotomy (PCNL) for total stone burden greater than 20 mm, yet it is unclear if the number of stones affects adherence to this guideline. We aim to assess the impact of stone multiplicity on the choice of ureteroscopy (URS) vs PCNL as a first-line therapy for patients with high burden (>20 mm), and examine whether the AUA guideline-discordant care impacts patient outcomes. Materials and Methods: Data were collected from the Registry for Stones of the Kidney and Ureter (ReSKU) database, a prospectively collected registry of patients with stone disease. Multivariate logistic regression (MLR) was used to estimate the association between stone multiplicity and the decision to perform URS for high stone burden (>20 mm) patients. MLR was further used to estimate the association between performing URS and the following outcomes: stone-free rate, need for a second operation, and complications. Postoperative hospital stay was compared between patients receiving URS vs PCNL using Student's t-test. Results: One hundred twenty-five patients were included in this analysis. For patients with total stone burden exceeding 20 mm, those with more than three stones had roughly nine times the likelihood of undergoing URS over PCNL compared with patients with a single stone (adjusted odds ratio 9.21, confidence interval [95% CI] 2.55-40.58, p = 0.001). Stone-free rates, Clavien-Dindo scores, and frequency of second-look operations did not differ significantly between URS and PCNL patients. URS patients were discharged an average of 1.26 days earlier than patients who received PCNL (95% CI 0.72-1.81, p < 0.001). Discussion: Stone multiplicity strongly predicts which patients with stone burden >20 mm will undergo URS and who will undergo PCNL. These deviations from AUA guidelines do not appear to worsen patient outcomes. These results suggest that careful consideration of each patient may warrant deviation from guidelines.

Sex differences in the therapy of kidney and ureteral stones.

PURPOSE OF REVIEW: Better understanding of sex differences affecting urolithiasis may help us offer tailored treatment strategies to our patients. RECENT FINDINGS: The incidence of urolithiasis is increasing and the male-to-female ratio has decreased from 3 : 1 to 1.3 : 1 between 1970 and 2000. In women, obesity has a larger effect on the risk of developing urolithiasis [odds ratio (OR) 1.35; 95% confidence interval (CI): 1.33-1.37] compared with men (OR 1.04; 95% CI: 1.02-1.06). Urolithiasis is a risk factor for coronary artery disease in men (risk ratio = 1.23; 95% CI: 1.02-1.49) and for stroke in women (risk ratio = 1.12; 95% CI: 1.03-1.21). Women tolerate cystoscopic stent removal and shock wave lithotripsy better than men. For shock wave lithotripsy menopaused women have reported lower visual analog scale scores than menstruating women (P < 0.001). Female sex was an independent predictor of stone impaction (OR 1.15; 95% CI: 1.03-1.27) and postoperative sepsis after ureteroscopy (OR 2.31; 95% CI: 1.14-4.37). SUMMARY: The sex gap in urolithiasis is closing. The changing role of women in society and dietary habits can be responsible for this epidemiologic shift. Women show a higher threshold for pain during urologic procedures, but they suffer from infectious complications more than men. Urolithiasis is a risk factor for cardiovascular events in both sexes.

Limited sensitivity and size over measurements of ultrasound affect medical decisions for ureteral stone compared to non-contrasted computed tomography.

PURPOSE: To evaluate the limited sensitivity and size over measurements of ultrasound (US) for ureteral stone, and demonstrate how this influenced medical decisions. PATIENTS AND METHODS: Retrospectively, we analyzed the data of patients with ureterolithiasis estimated by US and non-contrasted computed tomography (NCCT) within 48 h at our institution from January 1st 2014 to June 1st 2017. Stone size was grouped by the longest axis diameter on NCCT: < 5, 5-10, and > 10 mm. Then, US and NCCT results were compared for the sensitivity and measurements. RESULTS: A total of 614 cases of ureterolithiasis were visible on NCCT. The sensitivity of US for ureterolithiasis < 5, 5-10, and > 10 mm were 63.49, 79.06, and 84.67%, respectively (P = 0.001). US overestimated the size in 63.49 and 50.54% of patients with ureterolithiasis < 5 and 5-10 mm compared to NCCT, respectively (P < 0.001). Under the assumptions that patients with ureteral stone < 5, 5-10, and > 10 mm would be simply observed, received medical expulsive therapy (MET), and surgical interventions, 20.94 and 15.33% of patients with stone sized 5-10 and > 10 mm might be improperly observed due to negative US reports. Besides, 63.49 and 50.54% of cases with stone < 5 and 5-10 mm might receive more aggressive interventions ascribed to over measurements of US. CONCLUSIONS: Limited sensitivity and size over measurements of US might significantly influence medical decisions for ureteral stone. Inaccurate evaluation of US should be taken in consideration for appropriate counseling options.

Narcotic Pain Control for Ureterolithiasis Is Associated With Unnecessary Repeat Imaging in the Emergency Department.

A subset of patients with ureteral stones who present to the emergency department (ED) will return with recurring symptoms and will receive unnecessary repeat imaging. We retrospectively identified 112 patients from 2012 to 2016 diagnosed with at least one ureteral stone on computerized tomography (CT) at our institution who returned to the ED within 30 days. Patients were stratified based on the presence or absence of repeat CT scan imaging. Mean values were compared with independent t-test and proportions with chi-square analysis. Multivariate logistic regression was performed to determine independent predictors of repeat imaging. Sixty-eight patients (60.7%) underwent repeat CT scan imaging upon representation to the ED within 30 days of being diagnosed with ureterolithiasis. Ureteral stone position changed in 34 patients (30.4%) who underwent repeat imaging. On univariate analysis, younger age, nondiabetics, narcotics prescribed on discharge from first ED visit, and longer mean time between ED visits were associated with repeat CT scan imaging being performed (p < .05). Only prescription of narcotic pain medications was an independent predictor of repeat CT scan imaging (odds ratio: 3.18, 95% confidence interval: 1.22-8.28; p = .018). Nonsteroidal anti-inflammatory drugs or nonnarcotic pain medications, therefore, should primarily be used for pain control in these patients to avoid unnecessary testing.

CONTACT ULTRASOUND LITHOTRIPSY DURING URETEROLITHIASIS THERAPY. AN ANALYSIS OF LATE POSTOPERATIVE COMPLICATIONS.

Nowadays, ureteroscopy is highly effective and minimally invasive therapeutic and diagnostic method which is not connected with the risk of complications and with correlation of intracorporal lithotripsy and it is optimal at ureterolithiasis. The aim of the research is to analyze the causes and the character of late postoperative complications which occur in patients with ureterolithiasis after ureterorenoscopy and contact lithotripsy using ultrasound lithitriptor. After ureterorenoscopy with contact lithotripsy or lithoextraction from 1372 patients in 96 (6,9%) cases further postoperative complications were detected: in 81 (84,4%) vesicoureteral reflux was detected, and in 15 (15,6%) - ureteric stricture. It was proved by us that when localization of the stones in the upper and the middle thirds, the probability of the development of late postoperative complications does not depend on the size of the stones, with the localization of the stones in the lower sections of the ureter, complications are found much more often with stones sizes of 1,0 cm and more. Analyzing the density characteristics of stones, it should be noted that, regardless of the location of the stone, the possibility of the development of late postoperative complications increases with a stones density of 1000 HU and more.