Table of Contents  
Year : 2016  |  Volume : 18  |  Issue : 2  |  Page : 229-233

Recurrent varicocele

Department of Surgery, division of Urology, Brown University, 2 Dudley Street, Suite #174, Providence, RI 02905, USA

Date of Submission07-Sep-2015
Date of Decision04-Dec-2015
Date of Acceptance07-Dec-2015
Date of Web Publication15-Jan-2016

Correspondence Address:
Dr. Mark Sigman
Department of Surgery, division of Urology, Brown University, 2 Dudley Street, Suite #174, Providence, RI 02905
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1008-682X.171578

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Varicocele recurrence is one of the most common complications associated with varicocele repair. A systematic review was performed to evaluate varicocele recurrence rates, anatomic causes of recurrence, and methods of management of recurrent varicoceles. The PubMed database was evaluated using keywords "recurrent" and "varicocele" as well as MESH criteria "recurrent" and "varicocele." Articles were not included that were not in English, represented single case reports, focused solely on subclinical varicocele, or focused solely on a pediatric population (age <18). Rates of recurrence vary with the technique of varicocele repair from 0% to 35%. Anatomy of recurrence can be defined by venography. Management of varicocele recurrence can be surgical or via embolization.

Keywords: infertility; recurrence; varicocele

How to cite this article:
Rotker K, Sigman M. Recurrent varicocele. Asian J Androl 2016;18:229-33

How to cite this URL:
Rotker K, Sigman M. Recurrent varicocele. Asian J Androl [serial online] 2016 [cited 2022 Aug 14];18:229-33. Available from:

  Introduction Top

Varicoceles are defined as dilation of the veins of the pampiniform plexus. They are found in approximately 15% of adolescent male subjects and in >30% of men evaluated for infertility. [1],[2] They represent a reversible cause of male factor infertility. Diagnosis of clinical varicocele is made by physical examination. Indications for varicocele surgery include testicular hypotrophy, infertility, and scrotal pain. Methods for correction of varicoceles are open surgical, laparoscopic, or percutaneous techniques.

One of the most common complications with varicocele surgery is varicocele recurrence. Recurrence rates vary widely and may be dependent on the population being studied (e.g., pubertal vs adult), indications for initial intervention (e.g., testicular atrophy vs infertility vs pain), degree of initial varicocele (e.g., subclinical vs clinical), technique employed (e.g., open vs laparoscopic vs percutaneous), definition of recurrence (e.g., clinical vs subclinical), and follow-up period. To determine rates of varicocele recurrence following various treatment methods among infertile men as well as to evaluate methods of treatment of recurrence in this population, a systematic literature review was performed.

  Methods Top

A literature search was performed in the PubMed database using MESH criteria "varicocele" and "recurrence" as well as terms "varicocele" and "recurrence." Most PubMed data are from 1966 on but the database includes selected records dating back earlier. No date constraints were placed on the PubMed query, which was performed during August 2015. All published articles were evaluated and exclusion criteria for search included nonhuman subjects and non-English articles. Using PubMed terms, 254 articles were identified and using MESH criteria, 125 articles were identified with many overlapping articles. Articles were then evaluated and excluded if they represented single case reports, focused solely on subclinical varicoceles, focused on nontesticular varicoceles, failed to mention recurrence rates or focused solely on pediatric population. Data on recurrence rates, type of varicocele repair, anatomic cause of recurrence, and management of recurrence were recorded. We also searched the references of included studies to identify additional, potentially relevant studies. Included articles were grouped by method of repair evaluated and whether focus was on initial or recurrent varicocele population. Data were extracted from included articles as it related to recurrence rates after various techniques, anatomy/causes of recurrent varicocele, and treatment outcomes after recurrent varicocele repair. [Table 1] provides a list of the studies evaluated.
Table 1: List of studies included in the review of recurrent varicocele

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  Rates Of Recurrent Varicocele Top

A systematic review performed from 1980 to 2008 identified 36 studies reporting outcomes of varicocele treatment in infertile men with palpable unilateral or bilateral varicocele and abnormal semen parameters without azoospermia. [3] Of these, 16 studies looked at recurrence rate as an outcome. Various surgical techniques were employed, and published rates of recurrence for each were compared. Four studies employed the retroperitoneal high ligation (Palomo) technique and overall recurrence rate for this method was cited at 14.97% (7%-35%). [4],[5],[6],[7] Ten studies employed a microsurgical approach (6 sub-inguinal and 4 inguinal) finding an overall recurrence rate of 1.05% (0%-3.57%). [5],[6],[8],[9],[10],[11],[12],[13] Two studies employed a macroscopic inguinal or sub-inguinal approach citing an overall recurrence rate of 2.63% (0%-37%). [7],[14] Five studies evaluated the laparoscopic approach and found an overall recurrence rate of 4.3% (2.17%-7.14%). [5],[15],[16],[17],[18] Finally, two studies looked at radiologic embolization for varicocele and found an overall recurrence rate of 12.7% (2%-24%). [7],[19] The mean follow-up, for those studies that listed it, ranged from 6 to 25 months. The authors concluded that open microsurgical inguinal or sub-inguinal varicocelectomy led to the fewest recurrences, which they attributed to the ability of the surgeons to visualize and ligate all spermatic veins with the higher magnification. [3]

Another recent meta-analysis identified randomized controlled trials comparing open nonmicrosurgical, laparoscopic, or microsurgical varicocelectomy procedures in adults with male infertility. The included patients had to have been infertile >12 months with a clinically palpable varicocele, a defect in semen analysis and where the female partner had a normal examination. Only four studies were found to meet inclusion criteria, and a total of 1015 patients were evaluated. [4],[20],[21],[22],[23] Mean follow-up for these studies was 18 months (11-26), 21 months (4-35) and 17.4 months. The final study did not list a mean follow-up period but stated that patients were evaluated at 4 and 12 months. The pooled data revealed the incidence of recurrent varicocele to be 17.2% (34/198 cases) for laparoscopic technique, 1.9% (10/518 cases) for microscopic technique, and 13.7% (68/497 cases) for open technique. This was significantly lower after microsurgery than after laparoscopic or open varicocelectomy (OR = 0.12, 95%CI 0.06, 0.32 and OR = 0.13, 95%CI 0.07, 0.25, respectively), while there was no significant difference between laparoscopic and open varicocelectomy (OR = 1.55, 95%CI 0.88, 2.76). The authors again concluded that the microsurgical technique led to a significant reduction in postoperative recurrence, which they attributed to the fact that all internal and external spermatic veins can be ligated. Of note, due to a lack of studies, the differences between surgical approaches and embolization were not evaluated. [23]

More recent studies have shown rates of recurrence that are within range of those reported in the prior meta-analysis for laparoscopic (1.2%), nonmagnified inguinal (1.3%), open retroperitoneal (9.3%), microsurgical sub-inguinal (0.9%-2.5%), retrograde sclerotherapy (3.6%-8.6%), and antegrade sclerotherapy (9%) approaches with variable study criteria. [24],[25],[26],[27],[28],[29]

It is important to note that the length of follow-up time could significantly affect the recurrence rate. A study in the pediatric population found new recurrences after open repairs 15, 37, and 76 months out that were not palpated at 3, 14, and 63 months respectively. [30]

The clinical skills of the examining clinician may also affect the diagnosis of recurrent varicocele. A study of 15 patients whom had previously undergone laparoscopic varicocelectomy for grade III varicocele with asymmetry sought to determine clinical recurrence rate by four physicians with different levels of training. The patients also had a color Doppler ultrasound performed by a single operator. The four examiners determinations of recurrence had a positive predictive value ranging from 0.56 to 0.71, negative predictive value ranging from 0.67 to 1.00, sensitivity ranging from 0.71 to 1.0 and specificity ranging from 0.5 to 0.75. Therefore, the authors concluded that there was significant variability between clinical assessment and ultrasound results and recommended that ultrasound be used in every case of varicocele to give the most accurate diagnosis. However, the recurrence rate by ultrasound examination, which was considered the gold standard, was 80% (12/15) at a follow-up of 6-48 months. This is much higher than other published rates. In addition, the variability among observers was not listed and the difference seen between examination and ultrasound likely represents subclinical disease. [31] This suggests that ultrasound should not be routinely relied on for the diagnosis of recurrent varicocele.

  Causes Of Recurrent Varicocele Top

The reason for varicocele recurrence is often attributed to the surgical technique employed. As in the above studies, the higher rates of failure seen with macroscopic inguinal or sub-inguinal varicocelectomy are theorized to be secondary to missed smaller internal spermatic veins that later dilate and cause recurrence. The higher recurrence rate seen with the open retroperitoneal or laparoscopic approaches is often attributed to the inability to ligate external gonadal (cremasteric) vessels or the external spermatic vein in these procedures. Early studies by Coolsaet suggested that up to one-third of all patients with varicocele had reflux into the extrafunicular veins (cremasteric, external pudendal, deferential) [32] but the belief that varicocele or varicocele recurrence can be due to reflux into extrafunicular veins has been widely debated.

A 1999 study sought to demonstrate the presence of reflux in extrafunicular veins in patients with recurrent varicocele. Of 73 patients studied, 19 presented with recurrence after previous surgical correction (high ligation, inguinal ligation, or microsurgical spermatic epigastric vein shunt). All underwent left iliac vein venography, and a patent internal spermatic vein was demonstrated in all 19 recurrent cases. The authors concluded that "recurrent varicocele is due to persisting or recurrent reflux in the internal spermatic vein and that concomitant dilatation of the extrafunicular veins does not justify ligation." [33]

A recent study identified 15 patients with recurrent varicocele. The population was heterogeneous with varied ages (12-42), varied initial treatments and initial indications. Recurrence was determined by physical examination and ultrasound. 11 of the 15 underwent preoperative angiography (3 refused, 1 had contrast allergy). Of those 11, 7 were found to have patent internal spermatic veins and underwent embolization. 39% without patent veins on angiography (n = 4) underwent loupe-assisted or microsurgical sub-inguinal repair. In these cases, dilated internal spermatic veins in combination with dilated external spermatic or gubernacular veins were seen despite no evidence on angiography. [34] It is unclear if the dilated external spermatic or gubernacular veins were causing recurrence or just dilated from increased flow of venous blood following ligation of the internal spermatic veins during the initial varicocele surgery.

A study of 17 patients undergoing endovascular embolization for recurrent postsurgical varicocele retrospectively sought to evaluate the venous anatomy in even greater detail. The authors used the anatomic categorization previously described in works by Bδhren et al. and Sigmund et al. [35],[36] ([Table 2] and [Figure 1]). The patients varied in age (13-54 years), indication, length of time since varicocelectomy (mean 48 months) and previous treatment method utilized. Eleven of seventeen patients evaluated exhibited Bδhren type III anatomy with collaterals draining into a single gonadal vein with duplications being found most frequently in the pelvis and inguinal canal. Two patients each exhibited type I and type II anatomy and 1 patient each exhibited type IV and type V anatomy. Sixteen of seventeen patients had successful embolization without recurrence. The authors concluded that redundancies of the gonadal veins near the inguinal canal appear to be responsible for the majority of postsurgical recurrent varicoceles. [37]
Figure 1: Schematic of Bähren et al.35 classification of types of varicocele, published in 1983

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Table 2: Bähren et al.35 classification of types of varicocele, published in 1983

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A very similar study was performed on 33 men with recurrent varicocele after surgical intervention. They underwent venography before embolization and it was again found that the majority of patients (66%) had a type III duplication and that no recurrences were seen after embolization in a mean 14-month follow-up. Interestingly, the study did find that the redundancies of the gonadal vein tended to occur in the mid-portion of the vein (39%) in contrast from the previous study where the majority were seen low near the inguinal canal. [38]

Although technique is often cited as the most likely contributing factor to recurrence, one study of 255 men evaluated with primary infertility found that lower body mass index might be an independent predisposing factor for varicocele recurrence. The BMI score of the recurrent varicocele group (24.8 ± 2.9) in this study of infertile men with clinical varicoceles who underwent open sub-inguinal varicocelectomy, was significantly lower than that of the nonrecurrent or control group (26.9 ± 2.9) (P < 0.001). They determined that a one-unit decrease in BMI score correlated with a 1.25 times increased risk of varicocele recurrence using a logistic regression model. The authors concluded that low BMI could be an indicator for performing a microsurgical technique to lower risk of recurrence. [39]

  Treatment Of Recurrent Varicocele Top

Few studies address effectiveness of different approaches in treating recurrent varicoceles when they occur and to our knowledge no head-to-head or randomized controlled trials exist. The studies evaluating the treatment of recurrent varicoceles are invariably small, uncontrolled and include a heterogeneous population.

Three studies were identified that looked at surgical treatment and two studies reported embolization of recurrent varicoceles. One looked at 54 men referred for recurrent varicocele who underwent testicular artery and lymphatic-sparing sub-inguinal microsurgical varicocelectomy for varicocele recurrence. The initial treatment method varied with 74% having had nonmicrosurgical inguinal varicocelectomy, 10% having had retroperitoneal high ligation, 4% having undergone microsurgical inguinal varicocelectomy, and 2% having undergone nonmicrosurgical sub-inguinal varicocelectomy. Age (16-52 years) and initial indication also varied in this population. Mean serum testosterone, mean testicular volume, median sperm concentration, percent motility, and total motile sperm per ejaculate all improved significantly after repeat varicocelectomy. No recurrences were seen and an overall pregnancy rate of 40% was achieved (via natural insemination, IUI and IVF) in a mean 24 weeks follow-up. [40] Another identified 23 patients with clinical recurrences after high retroperitoneal or transinguinal ligation who underwent subsequent open varicocelectomy with a macroscopic sub-inguinal approach. Recurrence after redo operation was diagnosed based on both clinical examination and scrotal radioisotope scan and 21/23 (91.3%) men had no recurrence with 1-year follow-up. 19/23 (82.6%) had marked improvement in semen parameters while two more had a minor improvement. [41] The third publication reported on 12 patients with recurrent clinical varicoceles after "nonmicrosurgical varicocelectomy" specifically associated with orchalgia. The method used for prior varicoclectomy was not reported. All underwent microsurgical sub-inguinal varicocelectomy and no recurrences were seen at a mean 12 months follow-up. An overall favorable pain response was seen in 10/11 patients with 6 reporting complete resolution. No mention of semen parameters was made. [42]

Two studies were identified that looked at outcomes of recurrent varicocele treated with embolization. The first looked at 53 patients with recurrent varicocele who underwent antegrade sclerotherapy. The population was mixed in terms of age, indication and previous varicocele treatment method. Overall 2 out of 49 (4.1%) patients who were followed for a minimum of 6 months were found to have recurrence. Fertility parameters were not assessed. [43] A second evaluated 28 patients who had recurrent varicocele after laparoscopic, retroperitoneal, or inguinal ligation. Embolization was technically feasible in all but two cases (93%) and one patient was lost to follow-up. In the remaining 25 cases, 80% had complete resolution on physical examination, 16% had partial improvement, and 4% had no improvement at a median follow-up of 195 days. Semen parameters were not assessed. [44]

Two studies of patients undergoing antegrade sclerotherapy and retrograde embolization for varicocele also included a small subpopulation of patients who were being treated for recurrent varicocele. In those subanalyses, success rates of 92.5% and 77.8%, respectively were seen. [29],[45]

An additional study of 48 infertile men with recurrent varicoceles attempted to retrospectively determine risk factors for unsuccessful repeat varicocelectomy. The patients were grouped into those who had improvement in semen parameters after repeat microsurgical sub-inguinal variocelectomy (n = 21), those who did not have improvement after repeat microsurgical sub-inguinal varicocelectomy (n = 17), and those who chose not to undergo repeat varicocelectomy (n = 10). They reported that the significant predictive factors associated with successful redo varicocelectomy were lower follicle-stimulating hormone levels, lower peak retrograde flow on Doppler ultrasound, longer time to recurrence of varicocele, larger testicular volume preoperatively, and higher number of ligated veins during redo varicocelectomy. [46]

Without randomized studies and with the variable nature of each study drawing conclusions is difficult at best. Based on the data available, identifying an ideal method for treatment of recurrent varicocele is not possible.

  Expert Commentary Top

Based on the above reports, it is clear that the major reason for varicocele recurrence is the persistence of branched spermatic veins that were not ligated during the initial repair. While recurrence due to cremasteric, vasal, or gubernacular veins may be possible, current studies do not support a role for these veins in recurrence in the majority of patients. Many of the branches involved in recurrent varicoceles branch above the sub-inguinal level that may be why sub-inguinal approaches generally have the lowest varicocele recurrence rates.

At our institution, the initial treatment for infertile men with abnormal semen analysis and clinical varicocele is the microsurgical sub-inguinal approach without testicular delivery. This choice is based on the current evidence, which strongly suggests the lowest recurrence rates with this approach. Most of the studies employing surgical treatment of recurrent varicoceles used retroperitoneal or inguinal approaches for the initial approach. In those cases, a sub-inguinal approach would be technically feasible. However, if the initial approach were a sub-inguinal technique, repeat sub-inguinal surgery would be difficult and risk injuring the arterial supply of the testis. Because of this, we usually utilize embolization in these cases.

  Key Issues Top

  • Current evidence suggests that the initial treatment method most likely to prevent recurrences in an infertile man with a clinical varicocele is the microsurgical sub-inguinal or inguinal varicocelectomy
  • Varicocele recurrence is most commonly due to branches of the internal spermatic veins that were not initially ligated
  • Treatment of recurrence is warranted only in those patients with clinical recurrence that remain infertile or symptomatic
  • No strong evidence exists to suggest the ideal treatment for the recurrent varicocele and further randomized studies would be necessary to answer this question.

  Author Contributions Top

KR and MS worked to research the topic and draft the manuscript. All authors have read and approved the final version of the manuscript.

  Competing Interests Top

None of the authors declare competing financial interests.

  References Top

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  [Table 1], [Table 2]

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Rupin Shah, Ashok Agarwal, Parviz Kavoussi, Amarnath Rambhatla, Ramadan Saleh, Rossella Cannarella, Ahmed M. Harraz, Florence Boitrelle, Shinnosuke Kuroda, Taha Abo-Almagd Abdel-Meguid Hamoda, Armand Zini, Edmund Ko, Gokhan Calik, Tuncay Toprak, Hussein Kandil, Murat Gül, Mustafa Emre Bakircioglu, Neel Parekh, Giorgio Ivan Russo, Nicholas Tadros, Ates Kadioglu, Mohamed Arafa, Eric Chung, Osvaldo Rajmil, Fotios Dimitriadis, Vineet Malhotra, Gianmaria Salvio, Ralf Henkel, Tan V. Le, Emrullah Sogutdelen, Sarah Vij, Abdullah Alarbid, Ahmet Gudeloglu, Akira Tsujimura, Aldo E. Calogero, Amr El Meliegy, Andrea Crafa, Arif Kalkanli, Aykut Baser, Berk Hazir, Carlo Giulioni, Chak-Lam Cho, Christopher C.K. Ho, Ciro Salzano, Daniel Suslik Zylbersztejn, Dung Mai Ba Tien, Edoardo Pescatori, Edson Borges, Ege Can Serefoglu, Emine Saïs-Hamza, Eric Huyghe, Erman Ceyhan, Ettore Caroppo, Fabrizio Castiglioni, Fahmi Bahar, Fatih Gokalp, Francesco Lombardo, Franco Gadda, Gede Wirya Kusuma Duarsa, Germar-Mi
The World Journal of Men's Health. 2022; 40
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8 Can the Body Mass Index Predict Varicocele Recurrence Post-Intervention?
Saad Abumelha,Abdullah Alkhayal,Khalid Alrabeeah,Ahmed Khogeer,Ghassan I Alhajress,Mohammed Alabdulsalam,Yousof Al Zahrani
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9 The role of antioxidants in the treatment of infertile men with varicocele
T. V. Shatylko,S. I. Gamidov,A. Yu. Popova,T. B. Bitsoev
Meditsinskiy sovet = Medical Council. 2021; (13): 23
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10 Recurrent varicocele
S. V. Kotov,N. D. Korochkin,A. A. Klimenko
Vestnik Urologii. 2021; 9(2): 132
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11 Pediatric laparoscopic varicocelectomy using indocyanine green (ICG) fluorescence imaging
Keisuke Fukui,Takeshi Saito,Yasushi Fuchimoto
Journal of Pediatric Surgery Case Reports. 2021; : 101818
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12 Verbascoside attenuates experimental varicocele-induced damage to testes and sperm levels through up-regulation of the hypothalamus-pituitary-gonadal (HPG) axis
Letian Han,Shan Xiang,Baohai Rong,Yanchen Liang,Shengtian Zhao
Pharmaceutical Biology. 2021; 59(1): 715
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13 Ultrasound evaluation of varicoceles: systematic literature review and rationale of the ESUR-SPIWG Guidelines and Recommendations
Michele Bertolotto,Simon Freeman,Jonathan Richenberg,Jane Belfield,Vikram Dogra,Dean Y. Huang,Francesco Lotti,Karolina Markiet,Olivera Nikolic,Subramaniyan Ramanathan,Parvati Ramchandani,Laurence Rocher,Mustafa Secil,Paul S. Sidhu,Katarzyna Skrobisz,Michal Studniarek,Athina Tsili,Ahmet Tuncay Turgut,Pietro Pavlica,Lorenzo E. Derchi
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14 Effect of microsurgical varicocele repair on sexual functions and testosterone in hypogonadal infertile men with varicocele
Baris Saylam,Selahittin Çayan,Erdem Akbay
The Aging Male. 2020; : 1
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15 Fluorescence imaging in pediatric surgery: state-of-the-art and future perspectives
Irene Paraboschi,Paolo De Coppi,Danail Stoyanov,John Anderson,Stefano Giuliani
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Factors Associated with Varicocele Recurrence After Microscopic Sub-Inguinal Varicocelectomy

Mohammad Alkhamees,Saeed Bin Hamri,Turki Alhumaid,Layla Alissa,Haleema Al-Lishlish,Rula Abudalo,Zafar Iqbal,Ghufran Albajhan,Ahmed Alasker
Research and Reports in Urology. 2020; Volume 12: 651
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17 Dietary supplements in the management of varicocele-induced infertility: A review of potential mechanisms
Davood Arab,Hoda Doustmohammadi,Arash Ardestani Zadeh
Andrologia. 2020;
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18 Morinda Officinalis Polysaccharides Attenuate Varicocele-Induced Spermatogenic Impairment through the Modulation of Angiogenesis and Relative Factors
Zhu Zhu,Xiaozhen Zhao,Feng Huang,Feng Wang,Wei Wang
Evidence-Based Complementary and Alternative Medicine. 2019; 2019: 1
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19 The impact of age on fertility rate in patients who underwent microsurgical varicocelectomy
Mustafa Suat Bolat,Fatih Kocamanoglu,Murat Gulsen,Mesut Sengul,Ramazan Asci
Andrologia. 2019; : e13234
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20 Retroperitoneal high ligation versus subinguinal varicocelectomy: Effectiveness of two different varicocelectomy techniques on the treatment of painful varicocele
Ali Akkoç,Cemil Aydin,Ramazan Topaktas,Selçuk Altin,Murat Uçar,Murat Topçuoglu,Aykut Bugra Sentürk
Andrologia. 2019; : e13293
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21 Systematic review of treatment methods for recurrent varicoceles to compare post-treatment sperm parameters, pregnancy and complication rates
Selahittin Çayan,Irfan Orhan,Erdem Akbay,Ates Kadioglu
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22 Ultrasound evaluation of varicoceles: guidelines and recommendations of the European Society of Urogenital Radiology Scrotal and Penile Imaging Working Group (ESUR-SPIWG) for detection, classification, and grading
Simon Freeman,Michele Bertolotto,Jonathan Richenberg,Jane Belfield,Vikram Dogra,Dean Y. Huang,Francesco Lotti,Karolina Markiet,Olivera Nikolic,Subramaniyan Ramanathan,Parvati Ramchandani,Laurence Rocher,Mustafa Secil,Paul S. Sidhu,Katarzyna Skrobisz,Michal Studniarek,Athina Tsili,Ahmet Tuncay Turgut,Pietro Pavlica,Lorenzo E. Derchi
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25 Effects of Varicocele Treatment on Sperm Conventional Parameters: Surgical Varicocelectomy Versus Sclerotherapy
Laura Maria Mongioì,Luca Mammino,Michele Compagnone,Rosita Angela Condorelli,Antonio Basile,Angela Alamo,Sandro La Vignera,Giuseppe Morgia,Giorgio Ivan Russo,Aldo Eugenio Calogero
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26 Fate of Recurrent or Persistent Varicocele in the Era of Assisted Reproduction Technology: Microsurgical Subinguinal Redo Varicocelectomy Versus Observation
Selahittin Çayan,Erdem Akbay
Urology. 2018;
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27 Potential role of imaging in assessing harmful effects on spermatogenesis in adult testes with varicocele
Athina C Tsili,Olga N Xiropotamou,Anastasios Sylakos,Vasilios Maliakas,Nikolaos Sofikitis,Maria I Argyropoulou
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Tian-Zhong Yan,Xiao-Qiang Wu,Zhi-Wei Wang
Experimental and Therapeutic Medicine. 2017; 13(1): 45
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Ashok Agarwal,SandroC Esteves
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30 Afterword to varicocele and male infertility: current concepts and future perspectives
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