Browsing by Author "Günseren, Kadir Ömür"
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Publication Challenging risk factors for right and left laparoscopic adrenalectomy: A single centre experience with 272 cases(Brazilian Soc Urol, 2019-07-01) Kordan, Yakup; Günseren, Kadir Ömür; GÜNSEREN, KADİR ÖMÜR; Çiçek, Mehmet Cağatay; ÇİÇEK, MEHMET ÇAĞATAY; Vuruşkan, Hakan; VURUŞKAN, HAKAN; Yavaşçaoğlu, İsmet; YAVAŞCAOĞLU, İSMET; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; 0000-0002-0471-5404; 0000-0002-9947-848X; ABC-9924-2020Purpose: This study aimed to compare perioperative and postoperative results of right and left laparoscopic adrenalectomy (LA), and to evaluate the impact of challenging factors on these outcomes.Materials and Methods: A total of 272 patient's medical records that underwent single side LA between October 2006 and September 2017 were retrospectively reviewed. The patients were divided into 2 groups according to operation side. Moreover, pheochromocytoma, metastatic masses and adrenal lesions >5cm in size were considered to be difficult adrenalectomy cases and the outcomes of these cases were compared between two groups.Results: 135 patients (49.6%) underwent right LA and 137 patients (50.4%) underwent left LA. Operation time, estimated blood loss (EBL) and hospitalization time were similar between the groups (p=0.415, p=0.242, p=0.741, respectively). Although EBL was higher on the right side than the left (p=0.038) in the first 20 cases, after this learning period has been completed, there was no significant difference between the groups. In patients with pheochromocytoma, metastatic mass and a mass >5cm in size, despite bleeding complications were clinically higher on the right side, this difference was not statistically significant.Conclusions: During the learning period of LA, EBL is higher on the right side. Due to the greater risk of bleeding complications on the right side even on the hands of experienced surgeons, extra care and preoperative planning are required in patients with pheochromocytoma, metastatic masses and masses >5cm in size.Publication Comparison of laparoscopic pyelolithotomy and retrograde intrarenal surgery in the management of large renal pelvic stones(Wiley, 2021-03-02) Çiçek, Mehmet Çağatay; Asi, Tariq; Günseren, Kadir Ömür; Kılıçarslan, Hakan; ÇİÇEK, MEHMET ÇAĞATAY; GÜNSEREN, KADİR ÖMÜR; KILIÇARSLAN, HAKAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı; 0000-0002-0471-5404; 0000-0001-8673-3093; ABC-9924-2020; HGM-5995-2022; FGY-3115-2022Background To compare the clinical outcomes of laparoscopic pyelolithotomy (LP) and retrograde intrarenal surgery (RIRS) in the management of large renal pelvic stones.Patients and methods This study included patients who presented with a single renal pelvic stone sized >= 20 mm and who were treated primarily by LP or RIRS. The patients were grouped based on the surgical procedure they underwent. We retrospectively examined and compared the age, the longest axis, and the surface area of the stone, operation time, hospitalization time, complications, and stone-free rates of the two groups.Results Of the 156 patients included in the study, 44 had LP, and 112 had RIRS. Patients who received LP (13 males, 31 females) had a median age of 54 (18-79) years, while those who underwent RIRS (46 males, 66 females) had a median age of 54.5 (18-79). Patients who received LP were found to have larger median stone size (30 mm vs 24 mm, P = .003), longer operation time (100 minutes vs 70 minutes, P = .007), lower complication rate (2% vs 8.9%, P = .063), longer median hospital stay (3 days vs 1 day, P < .001) and better stone-free rate at the third month (90.9% vs 67.9%, P < .001).Conclusion LP is a safe and efficient procedure that could be used as an alternative to RIRS in managing large renal pelvic stones.Item Holmium laser enucleation, laparoscopic simple prostatectomy, or open prostatectomy: The role of the prostate volume in terms of operation time(Karger, 2021-02) Akdemir, Serkan; Yıldız, Ali; Arslan, Murat; Günseren, Kadir Ömür; Çiçek, Mehmet Çağatay; Yavaşçaoğlu, İsmet; Vuruşkan, Hakan; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020; JKJ-9881-2023; EIN-0828-2022; EFH-9523-2022; 56664496600; 57204319673; 6603612497; 6507328150Introduction: To compare the prostate removal speeds of 3 enucleation techniques and to evaluate how the operating times change depending on the prostate volume. Methods: Medical records of patients with 80-g or larger prostates who underwent holmium laser enucleation of the prostate (HoLEP), laparoscopic simple prostatectomy (LSP), or open prostatectomy (OP) due to medical treatment-resistant benign prostatic hyperplasia (BPH) were reviewed retrospectively. Patients were classified into 3 groups according to the surgical procedure. Age, BMI, prostate weights, total operation times, prostate removal speeds, hospitalization and catheterization days, complications, and improvements on functional outcomes in the 3rd month of follow-up were compared between groups. In addition, the association between prostate weight and total operation time was analyzed for each group. Results: HoLEP, LSP, and OP groups consisted of 60, 61, and 37 patients, respectively. While HoLEP was similar to OP in terms of prostate removal speed and total operation time, LSP was statistically slower and required more operation time than HoLEP and OP. There was a relationship between prostate weight and total operation time only in HoLEP. Conclusion: LSP, one of the enucleation techniques in the treatment of large prostates, was slower and required more operation time than HoLEP and OP in terms of total operation time and prostate removal speed. HoLEP seems going to be the fastest candidate for the rapid removal of large prostates in the future.Item Is 6 cm diameter an upper limit for adrenal tumors to perform laparoscopic adrenalectomy?(Mary Ann Liebert, 2021-03-05) Çicek, Mehmet Çağatay; Günseren, Kadir Ömür; Şenolu, Kazım; Vuruşkan, Hakan; Yavaşçaoğlu, İsmet; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Genel Cerrahi Anabilim Dalı.; 0000-0001-8673-3093; 0000-0001-6273-0664; HGM-5995-2022; EFH-9523-2022; EIN-0828-2022; 57204319673; 56664496600; 55632701500; 6507328150; 6603612497Background:We aimed to compare the results of patients who underwent laparoscopic adrenalectomy (LA) for masses >= 6 cm versus Materials and Methods:Three hundred thirty consecutive patients were divided into two groups according to tumor size (>= 6 and <6 cm in diameter). Demographic variables, body mass index (BMI), lesion localization (right/left), tumor diameter, pathological diagnosis and surgical outcomes, including operation time, estimated blood loss (EBL), conversion to open surgery, complications, and length of hospital stay were compared between groups. Results:Between February 2008 and March 2020, 53 patients (29 male-24 female) with >= 6 cm (L group) adrenal tumor and 277 patients (105 male-172 female) with <6 cm tumor (S group) underwent transperitoneal LA. One hundred sixty-eight (50.9%) tumors localized on the left side. In L group mean tumor size in female and male patients was 87.5 +/- 40.8 mm (range 50-225 mm) and 67.3 +/- 18.4 mm (range 10-100 mm), respectively (P < .05). Age, American Society of Anesthesiology scores, BMI, and mean operation time were similar between groups (P > .05). Postoperative complications were more often in L group (P = .005). EBL in group L and group S was 86 +/- 70.4 mL (range 10-500 mL) and 55 +/- 44.2 mL (range 10-300 mL), respectively (P = .003). Length of hospital stay in group L and group S was 3.7 +/- 3.5 days (range 1-26) and 3 +/- 1.6 days (range 1-9), respectively (P = .086). Significant variables in multivariate analysis, including gender (male), EBL, and postoperative complication rate, were entered into multivariate regression analysis, which presented that EBL and postoperative complication rates were independent significants for the L group. Conclusion:Six centimeters should not be considered as an upper limit of transperitoneal lateral LA and may be safely performed in centers with experience. Further studies are needed to confirm our data.Item Laparoscopic partial nephrectomy: Uludag University experience(Mary Ann Liebert, 2012-09) Vuruşkan, Hakan; Kordan, Yakup; Çiçek, Mehmet Çağatay; Yavaşçaoğlu, İsmet; Günseren, Kadir Ömür; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020Item Laparoscopic transperitoneal radical nephrectomy for renal masses with level I and II thrombus(Mary Ann Liebert Inc., 2018-01) Çınar, Önder; Günseren, Kadir Ömür; Çiçek, Çağatay; Vuruşkan, Berna Aytaç; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020; AAH-9746-2021; 56664496600; 57205388104; 56527372000Background: We aimed to report surgical and oncological outcomes of renal cell carcinoma (RCC) patients with level I and II thrombus treated with laparoscopic transperitoneal radical nephrectomy. Patients and Methods: Medical records of 13 patients were reviewed retrospectively in a single center between 2005 and 2017. Hem-o-lok((R)) clips were used to secure renal artery and renal vein, excluding 2 patients with an attached thrombus on the right side. Results: Seven male and 6 female patients were treated laparoscopically, and conversion to open surgery was not required in any case. The mean age was 61.67.8 years (range 45 to 75 years) and the mean body mass index was 27 +/- 4.6kg/m(2) (range 18.8 to 34.5kg/m(2)). Median tumor size was 9.5x7.3cm (range 5 to 14cm) and 5 patients who had preoperative metastases underwent cytoreductive nephrectomy. The mean operative time was 137.6 +/- 45.8 minutes (range 60 to 200 minutes) and blood loss was 105 +/- 34.9mL (range 50 to 150mL). The mean hospital stay was 4.4 +/- 3.9 days (range 1 to 15 days). Splenic capsular injury occurred in 1 patient and the vena cava was injured in another. Three patients needed blood transfusions. The mean follow-up period was 25 months (range 12 to 86 months). Conclusion: Laparoscopic transperitoneal radical nephrectomy can be reliable option for surgical management of RCC with level I and II thrombus in experienced centers.Item Laparoskopik donör nefrektomi hastalarının bir yıllık sonuçlarını etkileyen faktörlerin retrospektif değerlendirilmesi(Bursa Uludağ Üniversitesi, 2024) Bakırov, Javanshir; Günseren, Kadir Ömür; Bursa Uludağ Üniversitesi / Tıp Fakültesi / Üroloji Anabilim DalıSon dönem böbrek yetmezliği gelişen hastalarda en uygun tedavi seçeneği böbrek transplantasyonudur. Ülkemizde böbrek transplantasyonların büyük çoğunluğunu canlı vericiler oluşturmaktadır. Bazı çalışmalarda, donör nefrektomi sonrası vericilerde birinci yılında ortalama glomerüler filtrasyon hızı (GFH) düşüşünün %30-35 arasında olabileceği bildirilmiştir. Bu çalışmanın amacı kliniğimizin geniş laparoskopik donör nefrektomi serisini değerlendirmek ve vericilerdeki GFH değişimini predikte eden faktörlerin retrospektif analiz edilmesidir. Çalışmaya 259 laparoskopik donör nefrektomi hastası dahil edildi. Vericilerin 153’ü (%59.1) kadın, 106’sı (%40.9) erkekti ve nakil zamanındaki ortanca yaş 52 (22 - 78) yıl olarak bulundu. 1. senenin sonunda toplamda 259 vericiden 65’inde (%25.1) evre 3 ve üzeri kronik böbrek hastalığı (KBH) geliştiği görüldü. Çok değişkenli analiz sonucunda nakil yaşı, nakil sonrası erken postoperatif GFH’ın nakil öncesi GFH‘ya göre yüzdelik değişimi ve nakil öncesi LDL düzeyi ile böbrek fonksiyonlarının kötüleşmesi arasında anlamlı ilişki saptandı. (sırasıyla p=0.041, p=0.033, p=0.025) Bu faktörlere ait kesim noktası belirleyebilmek amacıyla ROC (Receiver Operator Characteristics Curve) analizi yapıldı. Analiz sonucunda ; yaş>52 yıl ve preop LDL>130 mg/dL olan hastalarda birinci yıl sonunda KBH gelişme riskinde artış olduğu belirlendi. Donör nefrektomi öncesi ve sonrası GFH değerleri karşılaştırıldığında, GFH düzeyindeki azalmanın %36 dan fazla olması durumunda bu vericilerde birinci yıl sonunda KBH riskinin arttığı belirlendi. Buna karşın vericilerin postop ve preop GFH değerindeki yüzdelik bir birim artışın KBH gelişim riskini %4 düzeyinde azalttığı belirlendi. Sonuç olarak donör nefrektomi yapılan hastanın yaşı, ameliyat öncesi değerine göre postop GFH değerindeki değişim ve preoperatif LDL değerinin bir senelik takip sonunda KBH gelişme riski ile ilişkili olduğu tespit edildi.Item Open vs laparoscopic simple prostatectomy: A comparison of initial outcomes and cost(Mary Ann Liebert, 2016-08) Demir, Aslan; Günseren, Kadir Ömür; Kordan, Yakup; Yavaşcaoğlu, İsmet; Vuruşkan, Berna Aytaç; Vuruşkan, Hakan; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020; AAH-9746-2021; 56664496600; 9633365800; 6603612497; 56527372000; 6507328150Introduction: We compared the cost-effectiveness of laparoscopic simple prostatectomy (LSP) vs open prostatectomy (OP). Patients and Methods: A total of 73 men treated for benign prostatic hyperplasia were enrolled for OP and LSP in groups 1 and 2, respectively. The findings were recorded perioperative, including operation time (OT), blood lost, transfusion rate, conversion to the open surgery, and the complications according to the Clavien Classification. The postoperative findings, including catheterization and drainage time, the amount of analgesic used, hospitalization time, postoperative complications, international prostate symptom score (IPSS) and International Index of Erectile Function (IIEF) scores, the extracted prostate weight, the uroflowmeter, as well as postvoiding residual (PVR) and quality of life (QoL) score at the postoperative third month, were analyzed. The cost of both techniques was also compared statistically. Results: No statistical differences were found in the preoperative parameters, including age, IPSS and QoL score, maximum flow rate (Q(max)), PVR, IIEF score, and prostate volumes, as measured by transabdominal ultrasonography. No statistical differences were established in terms of the OT and the weight of the extracted prostate. No differences were established with regard to complications according to Clavien's classification in groups. However, the bleeding rate was significantly lower in group 2. The drainage, catheterization, and hospitalization times and the amount of analgesics were significantly lower in the second group. The postoperative third month findings were not different statistically. Only the Q(max) values were significantly greater in group 2. While there was only a $52 difference between groups with regard to operation cost, this difference was significantly different. Conclusion: The use of LSP for the prostates over 80 g is more effective than the OP in terms of OT, bleeding amount, transfusion rates, catheterization time, drain removal time, hospitalization time, consumed analgesic amount, and Q(max) values. On the other hand, the mean cost of the LSP is higher than OP. Better effectiveness comes with higher cost.Item Penile plication with or without degloving of the penis results in similar outcomes(Elsevier, 2017-05-01) Kadirov, Rüstam; Coşkun, Burhan; Kaygısız, Onur; Günseren, Kadir Ömür; Kordan, Yakup; Yavaşçaoğlu, İsmet; Kılıçarslan, Hakan; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0002-9790-7295; 0000-0001-8673-3093; L-9439-2019; AAH-9704-2021; AAM-9726-2020; ABC-9924-2020; 57194857067; 36113105900; 16637252400; 56664496600; 9633365800; 6603612497; 56007473800Background: Penile plication techniques with or without degloving offer a minimally invasive option for the treatment of penile curvature. Aim: To review the outcomes of penile plication surgery and patient satisfaction with and without degloving of the penis. Methods: We conducted a retrospective analysis of 52 patients who underwent penile plication for the treatment of Peyronie disease or congenital penile curvature. Outcomes: Surgical success rates, complications, and patient satisfaction determined with the Treatment Benefit Scale were compared between groups. Results: The overall surgical success rate was 92.3% at a mean follow- up of 18.84 +/- 23.51 months. There were no intraoperative complications. In the degloving group, 42.6% of patients were greatly satisfied and 42.6% had better outcomes; in the without degloving group, 61.5% of patients were greatly satisfied and 30.8% had better outcomes. Comparison of outcomes was not statistically significant between groups. Clinical Implications: The results of the present study indicate the two techniques can be used for penile plication. Conclusion: With or without degloving, penile plication is safe and effective and provides high patient satisfaction.Item Retrograde intrarenal surgery (RIRS) in the treatment of renal calculi: Uludag university experience(Mary Ann Liebert, 2012-09) Çiçek, Mehmet Çağatay; Kılıçarslan, Hakan; Kordan, Yakup; Vuruşkan, Hakan; Gökçen, Kaan; Günseren, Kadir Ömür; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020Item The survival of flexible ureterorenoscopes in terms of the total stone area and total usage time(Mary Ann Liebert, 2020-05-01) Demir, Aslan; Günseren, Kadir Ömür; Kılıçarslan, Hakan; Çiçek, Mehmet Çağatay; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; ABC-9924-2020; 56664496600; 57204319673; 56007473800Introduction: We investigated the survival of a flexible ureterorenoscope (FURS) in regard to the total stone area (TSA) and total usage time (TUT) to determine the cutoff values for its survival. Materials and Methods: Data were obtained from 1326 patients who underwent flexible ureterorenoscopy. The stone area and the usage time of the FURS were obtained in each case. The data from each FURS were considered as a group. The TSA was calculated as the sum of the stones for which only one FURS broke, and the TUT was calculated as the sum of the time of use within the body in all cases during the tool's survival. Data from 13 groups of 1258 patients were analyzed in regard to the TSA and TUT. Results: We found a positive correlation of the case number with the TSA and TUT. The Pearson correlation coefficients were 0.983 and 0.937 for the TSA and TUT, respectively (p < 0.05). The mean case number, TSA, and TUT where only one FURS was used were 97.38 +/- 31.34, 11,886 +/- 4567.93 mm(2), and 5160 +/- 1570.52 minutes, respectively. The area under the curve (AUC) of the receiver operating characteristic curve of the FURS survival for the TSA was 91.7% (95% confidence interval [CI]: 0.76-1.07). The best cutoff value for the FURS survival was 6838 mm(2), with a sensitivity of 91%. The results for the AUC and the best cutoff value in regard to the TUT for using only one FURS were 66.7% (95% CI: 0.4-0.93) and 4617 minutes, respectively, with a sensitivity of 66%. If the cutoff value is taken as the average value of the TSA and TUT, the sensitivity rate drops to similar to 58% and 50%, respectively. Conclusion: FURS can be safely used when the stone area and TUT are about 9158 mm(2) and 4617 minutes, respectively, with a sensitivity of 66%.Publication The differences between the right and left side laparoscopic donor nephrectomy outcomes: A comparative analysis of single-center outcomes(Kare, 2021-02-26) Günseren, Kadir Ömür; Çiçek, Mehmet Çağatay; Aydın, Yavuz Mert; Özmerdiven, Çağdaş Gökhun; Yavaşcaoğlu, İsmet; GÜNSEREN, KADİR ÖMÜR; ÇİÇEK, MEHMET ÇAĞATAY; AYDIN, YAVUZ MERT; YAVAŞCAOĞLU, İSMET; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0001-8673-3093; 0000-0002-0471-5404; 0000-0002-6287-6767; AFP-3055-2022; ABC-9924-2020; HGM-5995-2022; EIN-0828-2022Objective: This study aimed to compare the right and left side laparoscopic donor nephrectomy (LDN) outcomes of a single center.Materials and Methods: The outcomes of patients who underwent LDN in our clinic between 2008 and 2020 were evaluated retrospectively. Two groups were consisted according to the side of the donor kidney. The gender, age, body mass index, duration of operation, amount of bleeding, warm ischemia time, drain removal time, and duration of hospitalization and complications were compared between groups.Results: A total of 314 patients were included in the study. Sixty-six patients underwent right LDN and 248 underwent left LDN. There was no difference between groups in terms of age, duration of operation, amount of bleeding, warm ischemia time, and complications (p>0.05). However, drain removal time and duration of hospitalization were longer in the left LDN group (p<0.05).Conclusions: The right LDN had similar intraoperative outcomes with the left LDN. However, failure on meticulous dissection of the lymphatic structures during left LDN might cause chylous drainage and prolonged hospitalization time.Item Üç yüz yirmibeş laparoskopik adrenalektomi vakasının retrospektif analizi: Tek merkez deneyimi(Bursa Uludağ Üniversitesi, 2021-06-22) Çiçek, Mehmet Çağatay; Günseren, Kadir Ömür; Cander, Soner; Vuruşkan, Hakan; Yavaşcaoğlu, İsmet; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Endokrinoloji Bilim Dalı.; 0000-0002-0471-5404; 0000-0001-8673-3093; 0000-0001-6303-7896; 0000-0002-3917-4847; 0000-0002-1788-1997Kliniğimizde çeşitli adrenal bez patolojileri nedeniyle laparoskopik adrenalektomi (LA) uygulanan hastaların intra-operatif ve post-operatif sonuçlarını değerlendirmeyi amaçladık. 2008 - 2020 yılları arasında LA uygulanan hastaların verileri retrospektif olarak değerlendirildi. Hastaların yaş, cinsiyet gibi demografik özellikleri, adrenal kitlenin boyutu, operasyon süresi, kanama miktarı, preop ve postop hemoglobin değerleri, hastanede kalış süresi, intraoperatif ve postoperatif komplikasyonlar açısından değerlendirildi. Patoloji raporları incelenerek kaydedildi. Çalışmaya 196’sı (%60.3) kadın ve 129’u erkek olmak üzere toplam 325 hasta dahil edildi. Yüz elliyedi hastaya sağ ve 168 (%51.7) hastaya sol LA uygulandı. Ortalama yaş 51.6 ± 12.1 ve ortalama kitle boyutu 40.3 ± 20.2 mm idi. Ortalama operasyon süresi 97 ± 36.2 dk ve ortalama kanama miktarı 50.8 ± 44.1 ml idi. Ortalama hastanede kalış süresi 3.1 ± 2.2 gün idi. İntraoperatif dönemde bir hastada distal pankreas yaralanması, 2 hastada kanama ile toplam 3 hastada intra-operatif komplikasyon gelişti. Bir hastda açık cerrahiye geçildi. Postoperatif dönemde 7 hastada komplikasyon görüldü. Tüm postoperatif komplikasyonlar ek girişime gerek kalmadan konservatif izlem ile tedavi edildi. LA, adrenal kitlelerin cerrahi tedavisinde tecrübeli merkezlerde güvenle uygulanabilecek efektif ve minimal invazif bir tedavi yöntemdir.Item Unfavorable anatomical factors influencing the success of retrograde intrarenal surgery for lower pole renal calculi(Urology and Nephrology Research Center, 2015-03) Kaynak, Yurdaer; Kılıçarslan, Hakan; Kordan, Yakup; Kaygısız, Onur; Coşkun, Burhan; Günseren, Kadir Ömür; Kanat, Feyzi Mutlu; Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0002-9790-7295; 0000-0001-8673-3093; FGY-3115-2022; GAF-0095-2022; AAM-9726-2020; AAH-9704-2021; ABC-9924-2020; IMZ-5184-2023; 56007473800; 9633365800; 16637252400; 36113105900; 56664496600; 56664310400Purpose: To determine the unfavorable factors, related to lower pole anatomical characteristics (LPACs), influencing the success of retrograde intrarenal surgery (RIRS) for lower pole renal calculi (LPC). Materials and Methods: We reviewed the data of 36 patients who underwent RIRS for LPC between October 2012 and October 2013. The infundibulopelvic angle (TA), infundibular length (IL) and infundibular width (IW) were measured on preoperative intravenous urographies. On follow-up stone-free status was defined as complete clearance at the first month kidney-ureter-bladder X-ray and computed tomography if necessary. Results: The median stone size was 10 mm (range, 5-35). The stone-free rates according to LPACs at the first month follow-up were 100% (n = 17), 57.9% (n = 11), 90% (n = 18), 62.5% (n = 10), 90.5% (n = 19) and 60% (n = 9) for patients with IPA >= 70 degrees, TA < 70 degrees, IL < 3 cm, IL >= 3 cm, IW >= 5 mm and IW < 5 mm, respectively. While TA and IW were associated with success of RIRS for LPC in multivariate analysis (P = .003 and P = .046, respectively), only IW was found to be a significant factor after applying multivariate analysis (P = .05). Conclusion: The results of our study demonstrated that only IW had a significant effect on the success rate of RIRS for LPC.