Orchiectomy

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"Orchi" redirects here. For the village in Iran, see Orchi, Iran.

Orchiectomy
Diagram showing how the testicle is removed (orchidectomy) CRUK 141.svg
Diagram of the incisions in an orchiectomy
Other namesOrchi
Specialtyurology

Orchiectomy (also named orchidectomy, and sometimes shortened as orchi) is a surgical procedure in which one or both testicles are removed. The surgery is performed as treatment for testicular cancer, as part of surgery for transgender women, as management for advanced prostate cancer, and to remove damaged testes after testicular torsion.[1][2][3][4] Less frequently, orchiectomy may be performed following a trauma, or due to wasting away of the testis or testes.[5] Historically, orchiectomy has been performed as a form of castration, and is still used to neuter dogs and cats for population control.[6][7]

Procedure[]

Simple orchiectomy[]

A simple orchiectomy is commonly performed as part of Sex reassignment surgery for transgender women , or as palliative treatment for advanced cases of prostate cancer. A simple orchiectomy may also be required in the event of testicular torsion.[5]

For the procedure, the person lies flat on an operating table with the penis taped against the abdomen. The nurse shaves a small area for the incision. After anesthetic has been administered, the surgeon makes an incision in the midpoint of the scrotum and cuts through the underlying tissue. The surgeon removes the testicles and parts of the spermatic cord through the incision. The incision is closed with two layers of sutures and is covered with a surgical dressing. If desired, prosthetic testicles can be inserted before the incision is closed to present an outward appearance of a pre-surgical scrotum.[8][9]

Subcapsular orchiectomy[]

A subcapsular orchiectomy is also commonly performed for treatment of prostate cancer. The operation is similar to that of a simple orchiectomy, with the exception that the glandular tissue that surrounds each testicle is removed rather than the entire testis itself. This type of orchiectomy is performed to remove testosterone-producing glandular tissue while maintaining the appearance of an ordinary scrotum.[8][9][3]

Inguinal orchiectomy being performed.

Inguinal orchiectomy[]

Main article: Inguinal orchiectomy

Inguinal orchiectomy (named from the Latin inguen for "groin", and also called radical orchiectomy) is performed when an onset of testicular cancer is suspected, in order to prevent a possible spread of cancer from the spermatic cord into the lymph nodes near the kidneys.[8][9]

An inguinal orchiectomy can be either unilateral (one testicle) or bilateral (both testicles). The surgeon makes an incision in the groin area (in contrast to an incision in the scrotum, as is done in both simple and subcapsular orchiectomies). The entire spermatic cord is removed, as well as the testicle(s). A long, non-absorbable suture may be left in the stump of the spermatic cord in case later surgery is deemed necessary.[8][9] After the cord and testicle(s) have been removed, the surgeon washes the area with saline solution and closes the layers of tissues and skin with sutures. The wound is then covered with sterile gauze and bandaged.[8][9]

Partial orchiectomy[]

Partial orchiectomy is an option for individuals with testicular masses that want to preserve their testes and their function. During surgery, the testis is exposed in a similar way to inguinal orchiectomy. Once the testis is exposed and the spermatic cord is clamped, there is a current debate as to whether surgeons should deliver cold ischaemia which means submitting the organ, in this case the testis, into a cold/freezing environment. Whether or not it is submerged and frozen, the next step is to cut the tunica vaginalis and an ultrasound is used to find the tumor. After, the tumor is scraped away from the testis in a process called enucleation. Following enucleation, biopsies are taken of the tissues surrounding the testicle where the mass once was. Afterwards, each layer or tunica of the testis is sutured up and the testis is placed back in the scrotum. The skin layers are also closed up with sutures.[10]

Pre-operative considerations[]

Guidelines state that fertility counseling should be offered to all patients undergoing inguinal orchiectomy, as there is a risk of reduced fertility or infertility. Testicular germ cell tumors (TGCT) accounts for 95% of cases of testicular cancer in young men.[10] TGCT is associated with abnormal semen parameters.[11] Because testicular cancer is commonly diagnosed in young, fertile men, it is critical that these individuals be educated on preserving their semen through freezing (cryopreservation) and complete a fertility assessment prior to surgery. In addition, testicular prosthesis placement counseling and education is encouraged to be given before an individual undergoes orchiectomy or before inguinal exploration with possibility of orchiectomy. This is an elective surgery which can be done at the time of orchiectomy. Testicular prosthesic placement has known psychological benefits (see below). Although risks for complications with prosthesis is low, individuals should also be informed of the possibility of infection, rotation, and replacement of prosthesis.[10]

Post-operative care[]

Following orchiectomy, those who have undergone the procedure are advised to avoid bathing, swimming, and heavy lifting for at least one month. If an individual had previously been taking hormone and/or hormone-blocking medications, modifications to their medication would be needed after the procedure. Any androgen-blocking medications, such as spironolactone or cyproterone, are stopped, and estrogen hormones can be resumed at the doctor's discretion. Post-operative pain management includes icing the surgical site, wearing supportive underwear, and the use of pain relief medications (analgesics) such as acetaminophen or ibuprofen; for more severe pain, narcotic analgesics may be needed. A follow-up appointment to monitor recovery and healing is routine.[1]

Risks and complications[]

Risks and complications should be discussed with an individual pre-operatively. Risks and complications for inguinal orchiectomy include scrotal hematoma (accumulation of blood in the scrotum), infection, post-operative pain (60% initially, 1.8% 1 year after), phantom testis syndrome (pain in the kidney as a result from trauma from the testicle), reduced fertility, and with the more rare complications being inguinal hernia, ilioinguinal nerve injury, tumor spillage, and hypogonadism.[10]

Effects[]

Unilateral orchiectomy results in decreased sperm count but does not reduce testosterone levels.[12][3] Bilateral orchiectomy causes infertility and greatly reduced testosterone levels. This can lead to side effects including loss of sexual interest, erectile dysfunction, hot flashes, breast enlargement (gynecomastia), weight gain, loss of muscle mass, and osteoporosis.[3] It has been discovered that some individuals with a history of prostate cancer who had bilateral orchiectomy had effects on their new bone production, resulting in increased risk of bone fractures due to testosterone deficiency after the procedure.[13]

Bilateral orchiectomy also reduces the use of exogenous medications for transgender women; the reduction in testosterone eliminates the need for testosterone-blocking medications and can contribute to feminizing features such as breast enlargement.[1][14][15]

Psychosocial effects[]

The loss of one or both testicles from orchiectomy can have severe implications in a male's identity and self-image surrounding masculinity, such that it can lead to an individual having thoughts of hopelessness, inadequacy, and loss. Among testicular cancer survivors who have lost a testicle, there are feelings of shame and loss, which are more evident in young and single men than older and non-single men.[16] As many as one third of individuals who will undergo orchiectomy are not offered the option of having a testicular prosthesis. Data shows that simply offering testicular prosthesis to individuals undergoing orchioectomy is psychologically beneficial. While some individuals do not mind losing a testicle, studies have shown that there is a change in body image in testicular cancer survivors who have underwent orchiectomy and an improvement in body image in 50-60% of individuals who undergo testicular prosthesis placement. One year after testicular prosthesis placement, there are reports of increase in self-esteem and psychological well-being during sexual activity in a study that followed up on post-orchiectomy individuals including adolescents.[17] On the other hand, there is a current debate whether children undergoing orchiectomy should be offered testicular prosthesis to be inserted at the time of orchiectomy procedure.[5][18]

Medical uses[]

Orchiectomy as a sex reassignment procedure[]

Bilateral simple orchiectomy is one option for sex reassignment surgery for transgender women.[1] It may be performed as a standalone procedure or at the same time as a vaginoplasty.[1] Bilateral orchiectomy is considered first before undergoing vaginoplasty. Vaginoplasty can still be administered after undergoing bilateral orchiectomy, as the orchiectomy preserves the penoscrotal skin that can later be transformed into a skin flap. Additionally, it is an option for those who are unable to undergo vaginoplasty due to the risk of complications.[14]

In addition to alleviating gender dysphoria, the procedure allows women to stop taking testosterone-blocking medications, which may cause unwanted side effects.[1] Some common testosterone-blocking medications that most use before undergoing orchiectomy are spironolactone and cyproterone. Common side effects caused by spironolactone are drowsiness, confusion, headache, fatigue, nausea/vomiting, gastritis, polyuria, polydipsia, and electrolyte imbalance (hyperkalemia). Cyproterone can cause side effects such as fatigue, low mood, and fulminant hepatitis. Orchiectomy allows individuals to stop taking these medications and avoid these adverse effects.[1] It is also an alternative for transwomen who have contraindications to antiandrogens and is a minimally invasive procedure to eliminate testosterone levels.[14]

Pre-operative evaluation[]

World Professional Association for Transgender Health (WPATH) criteria[]

Criteria from the World Professional Association for Transgender Health (WPATH) are used as a framework to guide health care professionals in approving or denying an orchiectomy. When a transgender individual wants to complete an orchiectomy, they are in a state of gender incongruence and they must meet the criteria before having the procedure done. The criteria are as follows:

"(i) persistent, documented gender dysphoria,

(ii) capacity to make informed decisions and consent to treatment,

(iii) well-controlled medical or mental health comorbidities, and

(iv) the use of hormone therapy for 12 months."[1]

Additionally, persons wishing to go through with the procedure are required to obtain referrals from two independent qualified mental health professionals. This referral should include "the individual's demographic information, psychosocial assessment results, duration of the therapeutic relationship, type of evaluation and therapy performed, if the criteria for surgery have been met and if informed consent has been obtained from the patient."[1]

Other medical considerations[]

An individual seeking to undergo orchiectomy is evaluated by a healthcare provider to ensure that the procedure is safe. Many candidates for orchiectomy are on estrogen therapy before the operation, which increases risk of intraoperative venous thromboembolism (VTE); thus, the provider must take this risk into account and determine whether prophylaxis (prevention) is necessary.[14] Current smokers, individuals with limited mobility, individuals older than the age of 40, and individuals who have a medical history of thrombolytic disorder are at higher risk of developing VTE. For these high-risk populations, the use of sequential compression devices during the operation is recommended to prevent VTE complications.[14]

Orchiectomy as diagnosis and treatment for testicular cancer[]

Testicular cancer most commonly occurs in males ages 15 to 34. In 2017, there were 8,850 new cases and 410 deaths in the United States.[19]

The American Urological Association (AUA) and European Association of Urology (EAU) 2019 guidelines recommend imaging with testicular ultrasound in any individual suspected of having testicular cancer following a physical examination. The ultrasound aids in differentiating diagnoses so that the inidividual may avoid the need of the surgical approach of inguinal orchiectomy. Inguinal orchiectomy is the gold standard treatment approach for those with confirmed malignancy of testicular cancer. Thus, it is imperative to diagnose the individual as having benign tumor vs. malignant tumor. Benign tumors are cancerous masses typically outside the testicle or surrounding it (extratesticular), whereas the malignant tumors typically lie within/inside the testicle (intratesticular).[10]

An orchiectomy is used not only as a treatment option, but also as a diagnostic tool for testicular cancer. Before an orchiectomy is deemed necessary, liver function tests, tumor markers, and various blood panels are taken to confirm the presence of testicular cancer. Tumor markers that may be checked include beta human chorionic gonadotropin, lactate dehydrogenase, and alpha fetoprotein. These markers are rechecked after orchiectomy to stage the testicular cancer.[19][10] Imaging, including chest radiography and an abdominal/pelvic CT (computed tomography) are also performed after orchiectomy to evaluate for metastasis.[19] An inguinal orchiectomy is the primary treatment for any cancerous tumor that is found in the testicles; however, in cases where tumors are small, testis- or testes-sparing surgery may be performed instead.[19]

Partial orchiectomy, also known as testis-sparing surgery, is another treatment option for smaller testicular masses which is becoming widely popular in recent years. This treatment option is an alternative to remove testicular cancer masses which are <20mm, have a high probability of being benign, and with negative serum tumor markers. Its benefits include preserving fertility and normal hormone function.[10]

About half of testicular cancer germ cell tumors are seminomas. Individuals with seminomas are 80-85% likely to have a stage 1 diagnosis and the individual must undergo surveillance every 3-6 months in the first year following their orchiectomy, with an abdominal/pelvic CT at 3,6 and 12 months. Additional treatment such as chemotherapy may be given if they have risk factors for a relapse. Men with stage 1 seminoma after orchiectomy have been shown to be free from a relapse for five years following orchiectomy.[19]

Orchiectomy as a complication of testicular torsion[]

Among children and adolescents diagnosed with testicular torsion, the orchiectomy rate is as high as 42%.[4] Though the goal during surgery is to correct the twist of the spermatic cord, orchiectomy is performed if the testicle is examined during the surgery to have dead tissue (necrosis) and suspected to no longer be a functioning testicle (no fertility).[4] Delays in diagnosis and treatment increase the risk of orchiectomy, with diagnosis in the first four to eight hours of symptoms being critical to prevent permanent ischemic damage, decreased fertility, and need for orchiectomy.[4][20][21]

Orchiectomy for prostate cancer[]

Prostate cancer, if non-metastatic, is commonly treated with radical prostatectomy or radiation therapy. Less often, orchiectomy is used to treat prostate cancer. Prostate cancer grows in the presence of testosterone. When testosterone is present, " it is metabolized and converted into dihydrotestosterone (DHT) which stimulates the growth of prostate cells. This leads to normal prostate growth in adolescents but contributes to abnormal cell growth in older men."[22] Reducing the amount of testosterone in a person is one way in which prostate cancer is treated. If the prostate cancer is in fact metastatic, then orchiectomy may be used "...to abolish the stimulation of cancer cells by inhibiting testicular testosterone production and thereby reducing androgen levels in the blood: so-called androgen deprivation therapy (ADT)."[23] Castration or orchiectomy is a suitable option for androgen deprivation therapy, and it should be used if a very quick reduction in testosterone levels is needed. However in recent years, orchiectomy is not commonly used since medical castration is a viable option.[23] Medical castration means that drugs or medications are used to suppress the production of androgens such as testosterone. Some examples of medications used in medical castration include, euprolide, goserelin (Zoladex), buserelin, and triptorelin (Trelstar).[24] Some of the side effects of these medications include but are not limited to "Reduced sexual desire and libido, Impotence, reduced size of testes and penis, hot flashes, growth of breast tissue (gynaecomastia) and pain across the breasts, thinning of the bones or osteoporosis and risk of fracture, anemia, loss of muscle mass, weight gain, fatigue and memory problems, and depression."[22]

Orchiectomy for pediatric testis tumors[]

Until the mid-1980's, pediatric testis tumors were managed in accordance with adult guidelines where the standard therapy was radical inguinal orchiectomy. It was later discovered that this procedure was being overused in the pediatric population, particularly those in pre-puberty, because it was assumed that the tumor was malignant.[25] It was discovered that the majority of the pediatric tumor registries over reported malignant tumors and had biased reporting. It has now been found that most tumors are benign lesions and the majority are cases of teratoma which act benign in pre-puberty pediatric individuals along with other benign tumors that have been reported such as: Sertolic cell tumor, Leydig cell tumor and juvenile granulosa cell tumors. The most malignant tumor that has been found in the pre-pubertal individuals is Pure yolk sac tumors.[25] There is a difference in pre-pubertal, post-pubertal, and adult testis tumors in their histology and their level of malignancy with malignant tumors being rate in the pre-pubertal pediatric population.[26][27]There has been a consideration to switch to testes sparing surgery (TSS) such as partial orchiectomy specifically for the pre-puberty pediatric populations who lack signs of malignant tumors.[25] Partial orchiectomy allows the ability to preserve hormone function and the possibility of reproduction in the future.[26][27] It has also been found to increase the quality of life. In the case that an individual is pediatric (<18 years of age) and is a post-pubertal with a malignant testes tumor, they must follow the adult recommended standard guidelines and proceed with radical inguinal orchiectomy.[25]

Post-pubertal populations[]

The post-pubertal pediatric population and adults are at higher risk of malignant tumors and usually have a histology of a mixed germ cell tumor. Their first line of treatment is radical orchiectomy; however, they may be candidates for testis-sparing surgery such as partial orchiectomy, if there is a presence of a benign tumor. Although partial orchiectomy is controversial for this group of individuals, it has been found to be a successful procedure for benign masses such as stromal tumors, epidermoid cysts, and fibrous pseudotumors.[25] There is greater use of partial orchiectomy with individuals who have small, benign testicular mass usually < 2 cm which indicate the tumors being benign. There is limited data on the size of tumors of the pediatric population, therefore, size cannot be used as a predictor of a tumor being benign.[25]

History[]

Orchiectomy (and castration) has been around for thousands of years with evidence from the Biblical times as well as texts from ancient Rome and China. Orchiectomy was seen as a way to get rid of aggression and was used as a sort of punishment. A common noble man in ancient times were the eunuchs who were male servants for the royal court. Eunuchs had both testicles removed, or both testicles and penis removed as it was thought it would make them more loyal and reliable to the court. They are referenced in Biblical, Roman, and Chinese history.[6] In Europe, there was also the practice of orchiectomy for the treatment of inguinoscrotal hernia (when a part of the intestine breaks from abdomen and spreads down into the scrotum), spread by French Physician Guy Chuliac in the early 14th century, who claimed that "a satisfactory herniotomy cannot be performed without castration". It was thought that removing the testicles was the only surgical solution for some time, until surgeons began searching for other ways to treat this condition. In the late 18th century, orchiectomy for hernia came to a halt as academic surgeons of the time came forward to renounce and condemn those who continued to operate orchiectomy on individuals who did not need it all. [6]

Orchiectomy in dogs[]

Bilateral orchiectomy, referred to as neutering or de-sexing in animals, is commonly performed in male dogs to prevent unwanted reproduction, given overpopulation and limitations in resources for animal shelters, humane societies, and rescues.[7] Neutering also confers health benefits, including reducing the risk of prostatitis and benign prostatic hyperplasia (BPH), preventing (or treating) testicular disorders and cancers, and extending longevity in comparison to unneutered ('intact') animals.[7]

See also[]

References[]

  1. ^ Jump up to: a b c d e f g h i Francis C, Grober E, Potter E, Blodgett N, Krakowsky Y (2020). "A Simple Guide for Simple Orchiectomy in Transition-Related Surgeries". Sexual Medicine Reviews. 8 (3): 492–496. doi:10.1016/j.sxmr.2019.11.004. PMID 31959532.
  2. ^ Washington S, Bayne D, Butler C, Garcia M (2017). "215 Bilateral Orchiectomy For Transgender Patients: An Efficient Surgical Technique That Anticipates Future Vaginoplasty and is Associated with Minimal Morbidity". The Journal of Sexual Medicine. 14 (2): e91–e92. doi:10.1016/j.jsxm.2016.12.203. ISSN 1743-6095.
  3. ^ Jump up to: a b c d "Orchiectomy for Prostate Cancer". myhealth.alberta.ca. Archived from the original on 4 August 2021. Retrieved 4 August 2021.
  4. ^ Jump up to: a b c d Sharp VJ, Kieran K, Arlen AM (2013). "Testicular torsion: diagnosis, evaluation, and management". American Family Physician. 88 (12): 835–40. PMID 24364548.
  5. ^ Jump up to: a b c Okoye E, Saikali SW (2021). "Orchiectomy". StatPearls. Treasure Island (FL): StatPearls Publishing. PMID 32966007. Retrieved 30 July 2021.
  6. ^ Jump up to: a b c Glass JM, Watkin NA (1997). "From mutilation to medication: the history of orchidectomy". British Journal of Urology. 80 (3): 373–8. doi:10.1046/j.1464-410x.1997.00304.x. PMID 9313651.
  7. ^ Jump up to: a b c Reichler IM (2009). "Gonadectomy in cats and dogs: a review of risks and benefits" (PDF). Reproduction in Domestic Animals = Zuchthygiene. 44 Suppl 2: 29–35. doi:10.1111/j.1439-0531.2009.01437.x. PMID 19754532.
  8. ^ Jump up to: a b c d e Frey R (2004). "Orchiectomy". Gale Encyclopedia of Surgery. Heathline.com: The Gale Group, Inc. Archived from the original on 8 December 2013. Retrieved 28 August 2013.
  9. ^ Jump up to: a b c d e "Surgical Procedures: Orchiectomy — radical/simple". UrologyMatch.com. Retrieved 26 February 2018.
  10. ^ Jump up to: a b c d e f g Koschel SG, Wong LM (2020). "Radical inguinal orchidectomy: the gold standard for initial management of testicular cancer". Translational Andrology and Urology. 9 (6): 3094–3102. doi:10.21037/tau.2019.12.20. PMC 7807348. PMID 33457282.
  11. ^ Djaladat H, Burner E, Parikh PM, Beroukhim Kay D, Hays K (2014). "The Association Between Testis Cancer and Semen Abnormalities Before Orchiectomy: A Systematic Review". Journal of Adolescent and Young Adult Oncology. 3 (4): 153–159. doi:10.1089/jayao.2014.0012. PMC 4270136. PMID 25538860.
  12. ^ Ferreira U, Netto Júnior NR, Esteves SC, Rivero MA, Schirren C (1991). "Comparative study of the fertility potential of men with only one testis". Scandinavian Journal of Urology and Nephrology. 25 (4): 255–9. doi:10.3109/00365599109024555. PMID 1685802.
  13. ^ Hoff AO, Gagel RF (April 2005). "Osteoporosis in breast and prostate cancer survivors". Oncology. 19 (5): 651–8. PMID 15945345.
  14. ^ Jump up to: a b c d e Hehemann MC, Walsh TJ (2019). "Orchiectomy as Bridge or Alternative to Vaginoplasty". The Urologic Clinics of North America. 46 (4): 505–510. doi:10.1016/j.ucl.2019.07.005. PMID 31582025.
  15. ^ Haupt C, Henke M, Kutschmar A, Hauser B, Baldinger S, Saenz SR, Schreiber G, et al. (Cochrane Tobacco Addiction Group) (2020). "Antiandrogen or estradiol treatment or both during hormone therapy in transitioning transgender women". The Cochrane Database of Systematic Reviews. 11: CD013138. doi:10.1002/14651858.CD013138.pub2. PMC 8078580. PMID 33251587.
  16. ^ Schepisi G, De Padova S, De Lisi D, Casadei C, Meggiolaro E, Ruffilli F, et al. (2019). "Psychosocial Issues in Long-Term Survivors of Testicular Cancer". Frontiers in Endocrinology. 10: 113. doi:10.3389/fendo.2019.00113. PMC 6397854. PMID 30858829.
  17. ^ Cappuccio F, Rossetti S, Cavaliere C, Iovane G, Taibi R, D'Aniello C, et al. (2018). "Health-related quality of life and psychosocial implications in testicular cancer survivors. A literature review". European Review for Medical and Pharmacological Sciences. 22 (3): 645–661. doi:10.26355/eurrev_201802_14290. PMID 29461592.
  18. ^ Hayon S, Michael J, Coward RM (2020). "The modern testicular prosthesis: patient selection and counseling, surgical technique, and outcomes". Asian Journal of Andrology. 22 (1): 64–69. doi:10.4103/aja.aja_93_19. PMC 6958971. PMID 31744995.
  19. ^ Jump up to: a b c d e Baird DC, Meyers GJ, Hu JS (2018). "Testicular Cancer: Diagnosis and Treatment". American Family Physician. 97 (4): 261–268. PMID 29671528.
  20. ^ Schick MA, Sternard BT (2021). "Testicular Torsion". =StatPearls. Treasure Island (FL): StatPearls Publishing. PMID 28846325. Retrieved 29 July 2021.
  21. ^ Prater JM, Overdorf BS (1991). "Testicular torsion: a surgical emergency". American Family Physician. 44 (3): 834–40. PMID 1877426.
  22. ^ Jump up to: a b "What is medical castration?". News-Medical.net. 2014. Retrieved 30 July 2021.
  23. ^ Jump up to: a b Holm HV, Dahl AA, Klepp OH, Fosså SD (2017). "Modern treatment of metastatic prostate cancer". Tidsskrift for den Norske Laegeforening. 137 (11): 803–805. doi:10.4045/tidsskr.16.0265. PMID 28597635.
  24. ^ "The Role of LHRH Antagonists in the Treatment of Prostate Cancer". Cancer Network. 2021. Retrieved 30 July 2021.
  25. ^ Jump up to: a b c d e f Woo LL, Ross JH (2020). "Partial orchiectomy vs. radical orchiectomy for pediatric testis tumors". Translational Andrology and Urology. 9 (5): 2400–2407. doi:10.21037/tau-19-815. PMC 7658131. PMID 33209713.
  26. ^ Jump up to: a b Woo LL, Ross JH (2016). "The role of testis-sparing surgery in children and adolescents with testicular tumors". Urologic Oncology. 34 (2): 76–83. doi:10.1016/j.urolonc.2015.05.019. PMID 26094168.
  27. ^ Jump up to: a b Chung JM, Lee SD (2014). "Overview of pediatric testicular tumors in Korea". Korean Journal of Urology. 55 (12): 789–96. doi:10.4111/kju.2014.55.12.789. PMC 4265712. PMID 25512812.
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