Vanishing Testis Syndrome (Bilateral Anorchia)
What is Vanishing Testis Syndrome (Bilateral Anorchia)?
Vanishing testis syndrome, also called bilateral anorchia, is a rare condition where both testes are absent at birth. The testes likely formed during early pregnancy but disappeared before birth. This happens when blood flow to the testes stops during development, causing the tissue to break down and vanish.
Without testes, the body cannot produce testosterone or sperm naturally. The condition affects roughly 1 in 20,000 males. Boys with this condition are born with male external genitalia but have no testicular tissue anywhere in the body. This means no hormone production from the testes and no ability to produce sperm.
The condition is different from undescended testes, where the testes exist but have not moved into the scrotum. In vanishing testis syndrome, the testes are truly gone. Early diagnosis through blood testing helps families start hormone replacement therapy at the right time to support healthy development.
Symptoms
- Empty scrotum with no palpable testes on physical exam
- Absent or delayed puberty without hormone replacement
- Lack of facial and body hair development during teenage years
- No deepening of voice during puberty
- Reduced muscle mass and strength compared to peers
- Lower bone density that may lead to fractures
- Fatigue and low energy levels
- Difficulty concentrating or mood changes
- Infertility due to complete absence of sperm production
Many symptoms do not appear until puberty, when testosterone is needed for development. Infants and young children may show no obvious signs beyond the empty scrotum. Early blood testing can identify the condition before symptoms become apparent.
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Causes and risk factors
Vanishing testis syndrome occurs when the testes form normally in early pregnancy but then lose their blood supply. This happens between weeks 8 and 12 of pregnancy, during a critical window of development. When blood flow stops, the testicular tissue dies and is reabsorbed by the body. The exact cause of the blood flow interruption is not fully understood. Possible triggers include twisting of the spermatic cord, blood clots, or inflammation during fetal development.
The condition is not inherited and does not run in families. It happens randomly during pregnancy and is not caused by anything the mother did or did not do. There are no known risk factors that increase the chance of this condition. Boys with vanishing testis syndrome have normal chromosomes and normal male genetics. The issue is purely related to blood supply during a specific time in fetal development.
How it's diagnosed
Diagnosis begins with a physical exam showing an empty scrotum with no palpable testes. Blood tests are the key to confirming vanishing testis syndrome. Luteinizing hormone, or LH, is typically very high because the body tries to stimulate testes that are not there. Testosterone levels are very low or undetectable because there is no testicular tissue to produce it. This pattern of elevated LH with absent testosterone strongly suggests bilateral anorchia.
Imaging tests like ultrasound or MRI may be used to confirm that no testicular tissue exists anywhere in the abdomen or pelvis. Sometimes doctors perform a surgical exploration to look for any remaining tissue, but blood tests often provide the diagnosis without surgery. Rite Aid offers testing for luteinizing hormone as part of our flagship panel. Getting tested helps confirm the diagnosis early so hormone replacement can begin at the right developmental stage.
Treatment options
- Testosterone replacement therapy starting around puberty age to support normal development
- Regular monitoring of hormone levels to adjust testosterone dosing
- Calcium and vitamin D supplements to support bone health
- Strength training and weight-bearing exercise to build and maintain bone density
- Balanced nutrition with adequate protein to support muscle development
- Psychological support and counseling to address fertility and identity concerns
- Prosthetic testicular implants for cosmetic reasons if desired
- Fertility counseling, as natural conception is not possible without testes
- Annual bone density scans to monitor skeletal health
- Regular follow-up with an endocrinologist throughout life
Concerned about Vanishing Testis Syndrome (Bilateral Anorchia)? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
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Frequently asked questions
Undescended testes means the testes exist but have not moved down into the scrotum. Vanishing testis syndrome means the testes formed during pregnancy but then disappeared completely. In vanishing testis syndrome, there is no testicular tissue anywhere in the body. Blood tests showing very high LH and very low testosterone help distinguish between the two conditions.
Vanishing testis syndrome usually cannot be detected during routine pregnancy ultrasounds. The testes are very small during early pregnancy and difficult to see on imaging. The condition is typically discovered after birth during a physical exam. Some cases are not diagnosed until puberty when expected development does not occur.
Luteinizing hormone, or LH, is elevated because the pituitary gland keeps sending signals to stimulate testes that are not there. Normally, testosterone from the testes signals the brain to stop producing LH. Without any testosterone feedback, the pituitary keeps making more and more LH. This creates the pattern of very high LH with very low testosterone.
Testosterone replacement typically starts around the normal age of puberty, between ages 11 and 14. Starting at the right time helps boys develop secondary sex characteristics like deeper voice, muscle mass, and body hair. Early diagnosis through blood testing allows doctors to plan the timing of treatment. Delaying treatment can affect bone density, mood, and overall development.
Vanishing testis syndrome is not inherited and does not run in families. It happens randomly during pregnancy due to interrupted blood flow to the developing testes. Boys with this condition have normal male chromosomes and genetics. Future children of affected individuals will not have an increased risk of the condition.
Natural conception is not possible because there is no testicular tissue to produce sperm. However, assisted reproductive technologies may be options in the future. Some families choose sperm donation or adoption. Early counseling about fertility helps individuals and families plan for the future and address emotional concerns.
Without testosterone replacement, individuals face low bone density and increased fracture risk. Muscle mass and strength remain underdeveloped. Mood issues like depression and fatigue are common. Cardiovascular health may also be affected by long-term low testosterone. Regular treatment and monitoring prevent most of these complications.
During initial treatment and puberty, hormone levels should be checked every 3 to 6 months. Once stable on treatment, testing every 6 to 12 months is typical. Regular monitoring ensures testosterone doses are correct and that LH levels respond appropriately. Rite Aid offers convenient testing through Quest Diagnostics at over 2,000 locations.
Yes, testosterone comes in injections, gels, patches, and pellets. Injections are given every 1 to 2 weeks. Gels and patches are applied daily to the skin. Pellets are implanted under the skin and last several months. Your doctor will help choose the best form based on age, lifestyle, and preferences.
Yes, prosthetic testicular implants are available for those who want them. The implants are silicone devices placed in the scrotum during a surgical procedure. They provide a natural appearance but do not produce hormones or sperm. The decision to use implants is personal and should be discussed with a surgeon and mental health professional.