Skip to main content

The usefulness of flexible cystoscopy for preventing double-J stent malposition after laparoscopic ureterolithotomy



The aim of this study was to evaluate the role of flexible cystoscopy in preventing malpositioning of the ureteral stent after laparoscopic ureterolithotomy in male patients.


From April 2009 to June 2015, 97 male patients with stones >1.8 cm in the upper ureter underwent intracorporeal double-J stenting of the ureter after laparoscopic ureterolithotomy performed by four different surgeons. In the last 50 patients who underwent laparoscopic ureterolithotomy flexible cystoscopy was performed through the urethral route to confirm the position of the double-J stent, while in the first 47 correct positioning of the stent was confirmed through postoperative KUB. The demographic data and perioperative outcomes were reviewed retrospectively. Penalized logistic regression analysis was used to evaluate the effects of flexible cystoscopy.


Upward malpositioning of the ureteral stent was found in 9 of the 47 (19.1%) patients who underwent surgery without flexible cystoscopy. Among the 50 most recent patients who underwent surgery with flexible cystoscopy through the urethral route, upward malpositioning was observed in 10 (20%) patients. The factors preventing upward malpositioning of the double-J catheter in multivariate analysis were surgeon (p = 0.039) and use of flexible cystoscopy (p = 0.008).


Flexible cystoscopy is a simple, safe, quick, and effective method to identify and correct malpositioning of double-J stents, especially in male patients.

Trial registration

This study was registered with Registry on May 11, 2017 (retrospective registration) with a trial registration number of NCT03150446.

Peer Review reports


The treatment of large upper ureteral stones is still controversial [1, 2]. The American Urological Association (AUA) and the European Association of Urology (EAU) recommend that laparoscopic stone removal may be considered in rare cases in which shockwave lithotripsy (SWL), ureteroscopic lithotripsy (URS), and percutaneous nephrolithotomy fail or are unlikely to be successful [1,2,3,4,5]. In a recent meta-analysis of treatment of large proximal ureteral stones, Torricelli et al. reported that the outcomes of laparoscopic ureterolithotomy (LUL) for larger upper ureteral stones are favorable compared with those of URS, and LUL should be considered as a first-line option when flexible ureteroscopy is not available [6]. After such surgery, many surgeons prefer placing a double-J stent, a ureteral catheter that is passed through the ureter from the kidney to the bladder [7, 8]. Although double-J stent placement after LUL remains controversial, many urologists believe that it may help prevent postoperative urinary leakage [9].

Intracorporeal double-J stenting is technically difficult, and malpositioning often occurs after surgery in clinical practice [10]. However, the actual rate of malpositioning of stents has not been reported yet. Although clinicians use different ways to place double-J stents precisely, accurate stent placement before the closure of the ureteral incision might be difficult to confirm.

Upward malpositioning of the stent after surgery may necessitate removal of the stent using a ureteroscope. It is difficult to remove stents in the outpatient setting without anesthesia to reduce pain and discomfort, especially in male patients.

In this study, we used flexible cystoscopy through the urethral route before closure of the ureteral incision to confirm that the double-J stent was placed correctly in the bladder of male patients. Upon identification of upward malpositioning of the ureteral stent, position adjustments were performed by intracorporeally manipulating the ureteral stent through the incision site of the ureter. The aim of this study was to determine the malpositioning rate and predicting factors associated with upward malpositioning of intracorporeal double-J stents after LUL and to evaluate the usefulness of flexible cystoscopy in preventing such malpositioning in male patients.


From April 2009 to June 2015, a total of 97 male patients with large stones (>1.8 cm in size) of the upper ureter underwent LUL. In all patients, intracorporeal double-J stents were placed after surgery. In the first 47 patients, the surgery was finished without verification of double-J stent placement (this was done on postoperative imaging). In the latest 50 consecutive patients, flexible cystoscopy was performed through the urethral route before closure of the ureteral incision to determine whether the double-J stent was correctly placed in the bladder (Fig. 1).

Fig. 1
figure 1

The flowchart of the study

Patient demographic data such as age, height, weight, body mass index, stone level, stone size, degree of hydronephrosis, and previous ureteric procedures were reviewed retrospectively. The levels and sizes of stones were determined using kidney-ureter-bladder (KUB) radiography or computed tomography. The degree of hydronephrosis was determined using a scale from 0 to 4 according to the Society of Fetal Ultrasound grade system [11]. Perioperative data, including surgeon, surgical approach, and use of flexible cystoscopy, were also collected retrospectively. Perioperative outcomes such as operative time, upward malpositioning rate, and additional time for flexible cystoscopy were reviewed. We defined upward malpositioning as placement of the double-J stent such that its tip is straight instead of being curled on postoperative KUB radiography. Accordingly, we reviewed all postoperative follow-up KUB images.

To identify factors predicting malpositioning, logistic regression analysis was conducted with SPSS, version 22.0. To evaluate the effects of flexible cystoscopy in reducing the malpositioning rate, penalized logistic regression analyses were performed with SAS 9.4, with a p < 0.05 considered to represent a statistically significant difference.

Intracorporeal double-J stent insertion after laparoscopic ureterolithotomy

After placing the patient in a semilateral position, a skin and fascial incision was made laterally to the rectus muscle at the level of the umbilicus, and a 10-mm balloon trocar was inserted into the abdominal cavity. Subsequently, with the pneumoperitoneum maintained at 12 mmHg using CO2, two more trocars (10 and 5 mm) were introduced under laparoscopic view parallel to the first trocar. At the beginning of the procedure, the descending colon was reflected from its retroperitoneal attachment and moved medially to identify the ureter. Each stone was identified as a prominent bulge on a suspicious lesion. To prevent upward movement of the stone, careful dissection was performed while avoiding touching the ureter directly. A needle holder with a broken 15th blade tip was used to incise the ureter overlying the stone, which enabled a sharp, precise ureteral incision at the level of the stone. Subsequently, the stone was removed with a grasper. The ureter was then catheterized using a standard 6F double-J stent with both long and short guidewires inserted through two separate side holes of the stent that were closed at both ends. Then, the prepared stent was inserted in a bidirectional manner through the ureterotomy site, and the two guidewires were extracted.

Laparoscopic adjustment of double-J stent with flexible cystoscopy

From April 2013 to June 2015, the last 50 patients with large upper ureteral stones underwent LUL with flexible cystoscopy to confirm the correct positioning of the double-J stent. After intracorporeal insertion of the double-J catheter, additional endoscopic monitoring with flexible cystoscopy was performed. The surgeon manipulating the double-J catheter used monitor A, while an assistant inserted a flexible cystoscope into the bladder through the urethral route and determined whether the double-J stent was correctly placed in the bladder using monitor B before suturing the site of ureterotomy (Fig. 2). If the stent was well-placed, the flexible cystoscope was withdrawn. If the double-J stent was not visualized in the bladder, the surgeon pushed the stent inferiorly using a laparoscopic instrument and monitor A until the stent came out through the ureteral orifice on monitor B (Additional file 1). After placement of the stent, the ureteral incision was closed with 4–0 Vicryl interrupted sutures.

Fig. 2
figure 2

The operating room set-up. The surgeon who manipulates the D-J catheter uses monitor A, while the assistant inserts a flexible cystoscope and verifies if the double-J stent is positioned correctly using monitor B


The preoperative patient demographics are summarized in Table 1. The mean age was 53.46 ± 13.72 years. The mean stone size was 1.87 ± 0.33 cm, and all patients had upper ureteral stones. In 16 (16.5%) cases, the stones were of level L2 or below, whereas in the remaining 81 (83.5%) cases the level exceeded L2. One patient (1%) had hydronephrosis of grade 0, 26 (26.8%) of grade 1, 39 (40.2%) of grade 2, 17 (17.5%) of grade 3, and 14 (14.4%) of grade 4. Medical history review revealed that 23 patients (23.7%) had undergone SWL and 12 patients (12.4%) had undergone URS.

Table 1 Patient demographics and clinical characteristics

The perioperative data and outcomes are presented in Table 2. The mean operative time was 137.33 ± 52.44 min; 84 patients were treated using the transperitoneal approach and 13 patients using the retroperitoneal approach. The surgeries were performed by four surgeons (40, 26, 20, and 11 cases).

Table 2 Perioperative data and outcomes

On postoperative KUB radiography, we identified upward malpositioning of ureteral stents in 9 of the 47 (19.1%) patients who underwent surgery without flexible cystoscopy. Among the 50 most recent patients who underwent surgery with flexible cystoscopy through the urethral route, upward malpositioning was identified in 10 (20%). In these 10 patients, the upward malpositioning of the double-J stent was laparoscopically corrected, and there were no patients with upward malpositioning after surgery until the removal of the stents. The mean additional operative time required for flexible cystoscopy was 4 min and 30 s.

In univariate analysis, presence of hydronephrosis (p = 0.044) predicted upward malpositioning (Table 3). In multivariate penalized logistic regression analysis, surgeon (0.039) and flexible cystoscopy (0.008) were significant factors preventing malpositioning (Table 4).

Table 3 Univariate logistic regression analysis of variables affecting upward malpositioning of ureteral stents (SPSS version 22)
Table 4 Penalized logistic regression analysis of variables affecting upward malpositioning of ureteral stents (SAS version 9.4)


Several modalities are available for the treatment of large upper ureteral stones [12,13,14,15,16,17]. Although controversial, SWL and URS have been recommended by the AUA and EAU guidelines as the first choice for proximal large ureteral stones, whereas LUL has been used as one of the options in the management of upper urinary tract stones [5, 6]. With regard to the dimension of large proximal ureteral stones, it seems that there is no clear definition. In a recent meta-analysis, Torricelli et al. analyzed six randomized controlled trials for large upper ureteral stones. These six studies used different inclusion criteria in terms of stone size: two studies used 10 mm [13, 16], whereas the other three used 12 mm [17], 15 mm [12], and 20 mm [14]. In our study, we analyzed patients with stones exceeding 15 mm in size. The main advantage of LUL is the high probability of removing impacted stones in one session without additional procedures, whereas SWL and ureteroscopic approaches are characterized by higher risks of remnant stones, stone-free failure (especially in cases of large stones), impacted stones, and hard stones.

Although many surgeons prefer to insert double-J stents after LUL, there is controversy about whether ureteral stenting is necessary. Hammady et al. [18] performed a randomized controlled study and concluded that LUL without stent insertion is safe, cost-effective, and relatively quick. In addition, LUL without stenting does not require auxiliary procedures for removing the stent afterwards. On the other hand, Karami et al. [9] reported that placing a stent during LUL does not increase the operation time and may play an important role in preventing urinary leakage. In our study, there were no patients with flank pain or increased postoperative drainage after LUL with double-J stent placement.

The procedures used to insert the double-J stent intracorporeally after LUL are challenging and time consuming for inexperienced surgeons [10]. Therefore, various methods have been described to accomplish this successfully. In one of the most commonly used techniques, a retrograde double-J stent is placed beneath the stone using cystoscopy before LUL and advanced after stone removal [19,20,21,22,23,24].

Chen et al. [10] evaluated the feasibility of ureteroscope-assisted ureteral double-J stenting after LUL and found that it was a simple and safe alternative method of correct stent placement. However, retrograde cystoscopic or ureteroscopic stenting requires additional position changes. Moreover, cystoscopic retrograde stenting is associated with risks due to advancing the suture site without direct visualization. Alongside these retrograde cystoscopic or ureteroscopic stenting techniques, several intracorporeal stenting techniques have previously been described [25,26,27,28]. However, these techniques require fluoroscopic confirmation of correct placement after closing the ureter. It is difficult to place the film between the patient’s body and the operation table to take an intraoperative KUB image when the patient is draped. Additionally, it takes substantial time to obtain KUB radiography results. Moreover, upon recognition using KUB radiography and correction of a malpositioned double-J stent, another KUB image would be necessary to confirm correct positioning. Therefore, readjustment of the stent using intraoperative KUB radiography for guidance may be technically difficult and increase operative time, potentially leading to stent failure. In this regard, our technique does not require position changes or fluoroscopic confirmation. Furthermore, the additional time required for flexible cystoscopy was <2 min if the stent was correctly placed in the bladder. Even when the stent was not adequately placed in the bladder, the mean additional time for readjustment was only 4 min. Flexible cystoscopy is an especially suitable method for male patients who might experience moderate pain if ureteroscopic removal of the stent is needed after LUL because of its upward malpositioning.

Surgeon and use of flexible cystoscopy were significant predicting factors for upward malpositioning. To our knowledge, no previous studies related to malpositioning of double-J stents have addressed this question. It makes intuitive sense that the rate of malpositioning differs according to the operator. Experience of the surgeon is important in preventing malpositioning. However, all our surgeons had several cases of upward malpositioning. Additionally, the use of flexible cystoscopy resulted in a 100% success rate, and malpositioning was corrected with a p-value of 0.008 in our study.

We recognize several limitations in this study. The first is that the data were collected from four different surgeons with different surgical experience without randomization. The differences in the number of performed LUL among the surgeons may indicate different levels of experience, resulting in variations in operative time, blood loss, and complication rates.

The second limitation is a lack of precise definition of upward malpositioning of the double-J stent. In fact, criteria for deciding whether the double-J stent is accurately positioned have not been defined in any previous study. Additionally, in this retrospective study, methods for the removal of the double-J stent after LUL were not described in the medical records in many cases. Therefore, we defined upward malpositioning as placement of the double-J stent such that its tip is straight instead of being curled on postoperative KUB radiography. This strict definition may have contributed to the high rate of malpositioning of double-J stents in this study. This rate would be lower if malpositioning was defined to occur if the double-J stent had to be removed with an ureteroscope after LUL. In fact, flexible cystoscopy through the urethral route determined that the double-J stent was malpositioned in 10 of 50 cases (20%), which supports our assertion that the malpositioning rate in many cases is actually higher.

The third limitation of our study is the small sample size. Thus, future studies with a larger number of patients are needed.

Despite these limitations, our results show that flexible cystoscopy may be a useful method for confirming the placement of ureteral stents in the bladder and reducing malpositioning rates in male patients. The use of flexible cystoscopy after intracorporeal double-J stenting following LUL is an effective, quick, simple, and safe method that does not require position changes.


Intracorporeal double-J stenting during laparoscopic ureterolithotomy is technically difficult, and malpositioning of stents often occurs after surgery. Immediate correction of double-J stent malpositioning based on outcomes of flexible cystoscopy is a simple and effective method that can be used after laparoscopic ureterolithotomy.



American Urological Association


European Association of Urology


Estimated blood loss




Laparoscopic ureterolithotomy


Shockwave lithotripsy


Ureteroscopic lithotripsy


  1. Preminger GM, Tiselius HG, Assimos DG, Alken P, Buck AC, Gallucci M, et al. 2007 guideline for the management of ureteral calculi. Eur Urol. 2007;52:1610–31.

    Article  PubMed  Google Scholar 

  2. Bader MJ, Eisner B, Porpiglia F, Preminger GM, Tiselius HG. Contemporary management of ureteral stones. Eur Urol. 2012;61:764–72.

    Article  PubMed  Google Scholar 

  3. Tiselius HG, Ackermann D, Alken P, Buck C, Conort P, Gallucci M. Working party on Lithiasis EAoU. Guidelines on urolithiasis. Eur Urol. 2001;40:362–71.

    Article  CAS  PubMed  Google Scholar 

  4. Matlaga BR, Jansen JP, Meckley LM, Byrne TW, Lingeman JE. Treatment of ureteral and renal stones: a systematic review and meta-analysis of randomized, controlled trials. J Urol. 2012;188:130–7.

    Article  PubMed  PubMed Central  Google Scholar 

  5. Turk C, Petrik A, Sarica K, Seitz C, Skolarikos A, Straub M, et al. EAU guidelines on interventional treatment for urolithiasis. Eur Urol. 2016;69:475–82.

    Article  PubMed  Google Scholar 

  6. Torricelli FCM, Monga M, Marchini GS, Srougi M, Nahas WC, Mazzucchi E. Semi-rigid ureteroscopic lithotripsy versus laparoscopic ureterolithotomy for large upper ureteral stones: a meta - analysis of randomized controlled trials. Int Braz J Urol. 2016;42:645–54.

    Article  PubMed  PubMed Central  Google Scholar 

  7. Skrepetis K, Doumas K, Siafakas I, Lykourinas M. Laparoscopic versus open ureterolithotomy. A comparative study. Eur Urol. 2001;40:32–6. discussion 37

    Article  CAS  PubMed  Google Scholar 

  8. Kiyota H, Ikemoto I, Asano K, Madarame J, Miki K, Yoshino Y, et al. Retroperitoneoscopic ureterolithotomy for impacted ureteral stone. Int J Urol. 2001;8:391–7.

    Article  CAS  PubMed  Google Scholar 

  9. Karami H, Javanmard B, Hasanzadeh-Hadah A, Mazloomfard MM, Lotfi B, Mohamadi R, et al. Is it necessary to place a double J catheter after laparoscopic ureterolithotomy? A four-year experience. J Endourol. 2012;26:1183–6.

    Article  PubMed  Google Scholar 

  10. Chen IH, Tsai JY, Yu CC, Wu T, Huang JK, Lin JT. Ureteroscope-assisted double-J stenting following laparoscopic ureterolithotomy. Kaohsiung J Med Sci. 2014;30:243–7.

    Article  PubMed  Google Scholar 

  11. Fernbach SK, Maizels M, Conway JJ. Ultrasound grading of hydronephrosis: introduction to the system used by the Society for Fetal Urology. Pediatr Radiol. 1993;23:478–80.

    Article  CAS  PubMed  Google Scholar 

  12. Basiri A, Simforoosh N, Ziaee A, Shayaninasab H, Moghaddam SMMH, et al. Retrograde, antegrade, and laparoscopic approaches for the management of large, proximal ureteral stones: a randomized clinical trial. J Endourol. 2008;22:2677–80.

    Article  PubMed  Google Scholar 

  13. Fang YQ, Qiu JG, Wang DJ, Zhan HL, Situ J. Comparative study on ureteroscopic lithotripsy and laparoscopic ureterolithotomy for treatment of unilateral upper ureteral stones. Acta Cir Bras. 2012;27:266–70.

    Article  PubMed  Google Scholar 

  14. Kumar A, Vasudeva P, Nanda B, Kumar N, Jha SK, Singh H. A prospective randomized comparison between laparoscopic ureterolithotomy and semirigid ureteroscopy for upper ureteral stones >2 cm: a single-center experience. J Endourol. 2015;29:1248–52.

    Article  PubMed  Google Scholar 

  15. Liu YH, Zhou ZY, Xia A, Dai HT, Guo LJ, Zheng J. Clinical observation of different minimally invasive surgeries for the treatment of impacted upper ureteral calculi. Pak J Med Sci. 2013;29:1358–62.

    PubMed  PubMed Central  Google Scholar 

  16. Neto ACL, Korkes F, Silva JL, Amarante RD, Mattos MHE, Tobias-Machado M, et al. Prospective randomized study of treatment of large proximal ureteral stones: extracorporeal shock wave lithotripsy versus ureterolithotripsy versus laparoscopy. J Urol. 2012;187:164–8.

    Article  Google Scholar 

  17. Shao YA, Wang DW, Lu GL, Shen ZJ. Retroperitoneal laparoscopic ureterolithotomy in comparison with ureteroscopic lithotripsy in the management of impacted upper ureteral stones larger than 12 mm. World J Urol. 2015;33:1841–5.

    Article  CAS  PubMed  Google Scholar 

  18. Hammady A, Gamal WM, Zaki M, Hussein M, Abuzeid A. Evaluation of ureteral stent placement after retroperitoneal laparoscopic ureterolithotomy for upper ureteral stone: randomized controlled study. J Endourol. 2011;25:825–30.

    Article  PubMed  Google Scholar 

  19. Goel A, Hemal AK. Upper and mid-ureteric stones: a prospective unrandomized comparison of retroperitoneoscopic and open ureterolithotomy. BJU Int. 2001;88:679–82.

    Article  CAS  PubMed  Google Scholar 

  20. Nouira Y, Kallel Y, Binous MY, Dahmoul H, Horchani A. Laparoscopic retroperitoneal ureterolithotomy: initial experience and review of literature. J Endourol. 2004;18:557–61.

    Article  PubMed  Google Scholar 

  21. Bellman GC, Smith AD. Special considerations in the technique of laparoscopic ureterolithotomy. J Urol. 1994;151:146–9.

    CAS  PubMed  Google Scholar 

  22. Micali S, Moore RG, Averch TD, Adams JB, Kavoussi LR. The role of laparoscopy in the treatment of renal and ureteral calculi. J Urol. 1997;157:463–6.

    Article  CAS  PubMed  Google Scholar 

  23. Turk I. Laparoscopic ureterolithotomy: the Edinburgh experience. BJU Int. 2000;86:147–8.

    CAS  PubMed  Google Scholar 

  24. Feyaerts A, Rietbergen J, Navarra S, Vallancien G, Guillonneau B. Laparoscopic ureterolithotomy for ureteral calculi. Eur Urol. 2001;40:609–13.

    Article  CAS  PubMed  Google Scholar 

  25. Gaur DD, Joshi NR, Dubey M, Acharya UP. A simple technique for retroperitoneal laparoscopic JJ stenting of the ureter. BJU Int. 2003;91:725–6.

    Article  CAS  PubMed  Google Scholar 

  26. Khan M, Khan F. Innovative technique for ureteral stenting during retroperitoneal laparoscopic ureterolithotomy. J Endourol. 2005;19:994–6.

    Article  PubMed  Google Scholar 

  27. Fan T, Xian P, Yang L, Liu Y, Wei Q, Li H. Experience and learning curve of retroperitoneal laparoscopic ureterolithotomy for upper ureteral calculi. J Endourol. 2009;23:1867–70.

    Article  PubMed  Google Scholar 

  28. Choi KH, Yang SC, Lee JW, Rha KH, Han WK. Laparoendoscopic single-site surgery for ureterolithotomy: focus on intracorporeal stenting and suturing. Urology. 2010;76:1283–7.

    Article  PubMed  Google Scholar 

Download references


The authors thank all our participants for their gracious participation in this study.


This study was supported by a research grant (K1507921) from the Korea University Medical College (Seoul, Korea).

Availability of data and materials

The datasets used in the current study are available from the corresponding author upon a reasonable request.

Authors’ contributions

JK and SK have made substantial contributions to conception and design, or acquisition of data, or analysis and interpretation of data. SK, JC, JL, and JK have been involved in drafting the manuscript or revising it critically for important intellectual content. Each author should have participated sufficiently in the work to take public responsibility for appropriate portions of the content and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. And all authors have given final approval for the manuscript to be published.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Written informed consent was obtained from every patient for publication of this research report.

Ethics approval and consent to participate

This study was approved by the Institutional Review Board of Korea University Anam Hospital. (Committee reference number: 201705002).

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Author information

Authors and Affiliations


Corresponding author

Correspondence to Sung-Gu Kang.

Additional file

Additional file 1:

Correction of Double-J stent malposition using two monitoring system. When the double-J stent was not visualized in the bladder on field of vision of flexible cystoscopy, the surgeon pushed the stent inferiorly using a laparoscopic instrument and monitor A until the stent came out through the ureteral orifice on monitor B. (AVI 1961 kb)

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Kim, JY., Kang, SH., Cheon, J. et al. The usefulness of flexible cystoscopy for preventing double-J stent malposition after laparoscopic ureterolithotomy. BMC Urol 17, 44 (2017).

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI:


  • Laparoscopy
  • Stone disease
  • Ureteral calculus
  • Ureteral stent