Micro-TESE for Azoospermia: Procedure, Success Rates, Risks and Recovery
- naparyhealthtech16
- 1 day ago
- 9 min read
Being told that no sperm are present in the semen can be distressing, particularly for men who hope to have biological children.
However, azoospermia does not always mean that sperm production has completely stopped.
In some men with non-obstructive azoospermia (NOA), small areas within the testicle may continue to produce sperm even when sperm cannot be detected in the ejaculate.
Micro-TESE, short for microsurgical testicular sperm extraction, is a specialised procedure designed to search for these areas of sperm production.
Using an operating microscope, the surgeon can examine the testicular tissue and selectively retrieve tissue that may contain sperm.
The ESSM 2014 scientific programme included several sessions dedicated to micro-TESE, sperm retrieval and factors that may influence retrieval outcomes. ESSM 2014 Scientific Programme
What Is Micro-TESE?
Micro-TESE is a microsurgical procedure used to retrieve sperm directly from the testicle.
It is particularly relevant to selected men with non-obstructive azoospermia, where sperm production is severely impaired.
The key difference between micro-TESE and conventional TESE is the use of microscopic magnification.
This allows the surgeon to examine the testicular tissue more carefully and identify tubules that may be more likely to contain sperm.
The retrieved tissue is examined by an embryology or laboratory team to determine whether viable sperm are present.
What Is Non-Obstructive Azoospermia?
To understand why micro-TESE is used, it is important to understand non-obstructive azoospermia.
Azoospermia means that no sperm are detected in the ejaculate after appropriate semen analysis.
There are two broad categories:
Obstructive Azoospermia
Sperm production may be preserved, but an obstruction prevents sperm from reaching the semen.
Non-Obstructive Azoospermia
The main problem is impaired sperm production within the testicles.
In NOA, sperm production may be severely reduced or patchy.
This means that sperm may exist in very small areas even when they are completely absent from the ejaculate.
Why Can Micro-TESE Find Sperm When the Semen Contains None?
Sperm production within the testicle is not necessarily uniform.
In some men with non-obstructive azoospermia, most of the testicular tissue may show little or no sperm production, while very small areas may continue to produce sperm.
These isolated areas can be difficult to identify with conventional sperm retrieval techniques.
Micro-TESE allows the surgeon to systematically examine the testicular tissue under magnification and target areas that appear more likely to contain active sperm-producing tubules.
This is one of the reasons the technique is particularly relevant in selected cases of NOA.
Who May Be a Candidate for Micro-TESE?
Micro-TESE may be considered for men with confirmed non-obstructive azoospermia when sperm retrieval is being pursued for assisted reproduction.
Before recommending the procedure, a specialist will usually assess:
Repeated semen analyses
Medical and fertility history
Physical examination
Hormonal profile
Testicular volume
Genetic testing where indicated
Previous sperm retrieval attempts
The couple's reproductive plan
The aim is to determine whether micro-TESE is appropriate and whether there are other treatment options that should be considered first.
What Tests Are Needed Before Micro-TESE?
A thorough evaluation is essential before surgery.
Semen Analysis
Azoospermia should generally be confirmed with appropriate semen testing.
Sometimes sperm may be present in extremely small numbers, so the laboratory assessment needs to be performed carefully.
Hormonal Testing
Hormones such as:
FSH
LH
Testosterone
can provide information about testicular function.
The results need to be interpreted alongside the clinical examination and other investigations.
Genetic Testing
Genetic investigations may be recommended in men with non-obstructive azoospermia.
Some genetic abnormalities can significantly affect sperm production and may also influence whether surgical sperm retrieval is appropriate.
Physical Examination
The specialist may assess:
Testicular size
Testicular consistency
Presence of varicocele
Vas deferens
Other features that may help distinguish obstructive from non-obstructive causes
How Is Micro-TESE Performed?
The procedure is performed under appropriate anaesthesia.
Although the exact technique varies between patients and surgeons, the general process includes several stages.
Step 1: Surgical Access
A small incision is made to allow access to the testicle.
Step 2: Opening the Testicular Tissue
The surgeon carefully opens the testicular tissue to expose the seminiferous tubules.
Step 3: Microscopic Examination
An operating microscope is used to examine the tissue.
The surgeon looks for tubules that appear more likely to contain sperm-producing tissue.
Step 4: Selective Tissue Removal
Selected tissue is removed rather than taking large amounts of tissue indiscriminately.
Step 5: Laboratory Examination
The tissue is transferred to the laboratory, where an embryologist searches for sperm.
Step 6: Sperm Preparation
If viable sperm are identified, they may be prepared for use in ICSI.
What Happens If Sperm Are Found During Micro-TESE?
If viable sperm are identified, they may be used for intracytoplasmic sperm injection (ICSI).
ICSI involves injecting a single sperm directly into an egg.
Because sperm numbers can be extremely limited in men with NOA, ICSI is particularly useful when only a small number of sperm are available.
Depending on the treatment plan, retrieved sperm may also be cryopreserved for future use.
What Is the Success Rate of Micro-TESE?
There is no single success rate that applies to every man.
The chance of retrieving sperm varies according to:
Underlying cause of NOA
Genetic diagnosis
Hormonal profile
Testicular function
Histological pattern
Previous treatments
Previous sperm retrieval attempts
Published studies have reported different retrieval rates across patient populations.
Therefore, it is better to discuss the individual likelihood of sperm retrieval rather than relying on one percentage presented as a guarantee.
The ESSM programme specifically included scientific discussion of predictors of successful sperm retrieval in non-obstructive azoospermia, highlighting how outcomes can vary between patients. ESSM 2014 Scientific Programme
Can FSH Predict Whether Micro-TESE Will Work?
FSH is one of the markers used when assessing men with impaired sperm production.
However, FSH alone cannot reliably determine whether sperm will be found.
A man with a high FSH level may still have small areas of sperm production.
Similarly, a relatively normal FSH level does not guarantee successful sperm retrieval.
The result must therefore be interpreted together with:
Testicular size
Genetic findings
Clinical examination
Hormonal profile
Previous semen analyses
Other diagnostic information
Can Testicular Size Predict Micro-TESE Success?
Testicular volume can provide useful information about testicular function.
Men with significantly reduced testicular volume may have more severe impairment of sperm production.
However, testicular size alone cannot determine whether sperm will be found.
The specialist must consider the complete clinical picture.
What Genetic Conditions Affect Micro-TESE?
Genetic causes can play an important role in non-obstructive azoospermia.
For example, some men have Y-chromosome microdeletions that affect genes involved in sperm production.
The type and location of a genetic abnormality can influence the likelihood of finding sperm.
This is why genetic testing can be an important part of the evaluation before micro-TESE.
In some genetic conditions, surgical sperm retrieval may not be recommended because the likelihood of finding sperm is extremely low or because there may be important implications for future offspring.
Micro-TESE and Y-Chromosome Microdeletions
Y-chromosome microdeletions are an important genetic cause of severe male infertility.
The effect depends on the specific region affected.
Some types of Y-chromosome microdeletion are associated with a reasonable possibility of sperm retrieval, while others are associated with very poor prospects.
A genetic counsellor or male fertility specialist can explain the implications of the specific result.
What Are the Risks of Micro-TESE?
Micro-TESE is a surgical procedure and therefore carries potential risks.
These can include:
Pain
Swelling
Bruising
Bleeding
Infection
Haematoma
Temporary reduction in testicular function
Testicular damage
Reduced testosterone production in rare circumstances
The extent of risk depends on the individual patient and the amount of tissue that needs to be removed.
The potential benefits should always be balanced against these risks.
Does Micro-TESE Damage the Testicle?
One of the goals of microsurgical retrieval is to minimise unnecessary removal of testicular tissue.
The use of magnification allows the surgeon to identify and selectively remove tissue rather than taking larger random samples.
However, micro-TESE is still a surgical procedure involving the testicle.
The possibility of temporary or, less commonly, longer-term effects on testicular function should therefore be discussed before surgery.
How Long Does It Take to Recover From Micro-TESE?
Recovery varies from patient to patient.
After the procedure, temporary:
Pain
Swelling
Bruising
Tenderness
may occur.
Patients are generally given instructions regarding physical activity, exercise, sexual activity and wound care.
The timing of return to normal activities depends on the extent of surgery and individual recovery.
When Can You Exercise After Micro-TESE?
Heavy exercise and strenuous physical activity are usually avoided during the initial recovery period.
Walking and light activity may be resumed earlier, depending on how the patient feels and the surgeon's instructions.
Activities involving heavy lifting or significant pressure on the groin should generally be delayed until the surgical team considers them safe.
What Happens If Micro-TESE Finds No Sperm?
Unfortunately, sperm retrieval is not guaranteed.
If no sperm are identified, the specialist will need to review the findings and determine what options remain.
This may include:
Reviewing the original diagnosis
Reviewing genetic results
Reviewing hormonal findings
Reviewing the surgical findings
Considering whether another retrieval approach is appropriate
Discussing alternative reproductive options
The ESSM 2014 programme included a dedicated scientific discussion on management following failed micro-TESE, illustrating that unsuccessful retrieval requires a structured clinical approach rather than assuming that another procedure will automatically succeed. ESSM 2014 Scientific Programme
Can Micro-TESE Be Repeated?
In selected cases, repeat sperm retrieval may be considered.
However, the decision must be made carefully.
Before repeating the procedure, the specialist should consider:
Why the first retrieval was unsuccessful
The original surgical findings
Genetic results
Hormonal profile
Testicular function
The amount of tissue previously removed
A repeat procedure should have a clear clinical rationale.
Micro-TESE vs TESE: What Is the Difference?
Although both procedures retrieve sperm from testicular tissue, they are not identical.
Feature | TESE | Micro-TESE |
Tissue retrieval | Testicular tissue is removed | Tissue is selectively removed under magnification |
Microscope used | No | Yes |
Main application | Selected cases | Particularly useful in selected NOA |
Tissue selection | Less targeted | More targeted |
Surgical complexity | Lower | Higher |
The appropriate technique depends on the patient's diagnosis.
Micro-TESE vs TESA
These procedures are also different.
TESA
Uses a needle to aspirate tissue and sperm from the testicle.
Micro-TESE
Uses a surgical approach and microscopic magnification to search for sperm-producing areas.
For men with severe non-obstructive azoospermia, micro-TESE may be considered when a more targeted search for sperm is required.
Micro-TESE and ICSI
The main reproductive purpose of micro-TESE is usually to obtain sperm that can be used in assisted reproduction.
Once sperm are retrieved, ICSI can be performed.
The basic pathway is:
Micro-TESE↓Sperm identification↓Sperm preparation↓ICSI↓Embryo development↓Embryo transfer
The female partner will usually undergo her own fertility assessment and treatment as part of the overall IVF/ICSI plan.
Is Micro-TESE Better Than Conventional TESE?
For selected men with non-obstructive azoospermia, micro-TESE is designed to provide a more targeted approach to sperm retrieval.
However, "better" depends on the diagnosis and clinical circumstances.
The procedure is more technically demanding and requires specialised expertise.
The choice should therefore be based on:
Cause of azoospermia
Previous treatment
Testicular findings
Genetic profile
Availability of specialised expertise
Questions to Ask Before Micro-TESE
Before undergoing the procedure, it is reasonable to ask your specialist:
What is the cause of my azoospermia?
Do I have obstructive or non-obstructive azoospermia?
Why are you recommending micro-TESE?
What factors affect my chance of sperm retrieval?
What are the alternatives?
What happens if no sperm are found?
How will the retrieved sperm be used?
Will the sperm be frozen?
What are the risks to my testicular function?
How long will recovery take?
Understanding the treatment plan can help you and your partner make an informed decision.
Is Micro-TESE Right for You?
Micro-TESE is not a treatment that every man with azoospermia needs.
It is a specialised sperm retrieval technique mainly considered for selected men with non-obstructive azoospermia who are seeking biological fatherhood through assisted reproduction.
The most important step is establishing the diagnosis first.
A detailed evaluation can determine whether:
Sperm may be retrievable
Micro-TESE is appropriate
Another retrieval technique may be preferable
Medical treatment should be considered
Assisted reproduction should be planned
Micro-TESE for Azoospermia: Key Takeaway
Micro-TESE offers selected men with non-obstructive azoospermia an opportunity to search for sperm directly within the testicle when sperm cannot be found in the semen.
The procedure uses microscopic magnification to identify and selectively retrieve testicular tissue that may contain sperm.
However, successful sperm retrieval cannot be guaranteed.
The likelihood of success depends on the underlying cause of azoospermia, genetic findings, testicular function and other individual factors.
For this reason, micro-TESE should be planned as part of a complete male fertility assessment and, when appropriate, an IVF/ICSI treatment strategy.
Book a Male Fertility Consultation
If you have been diagnosed with non-obstructive azoospermia and want to know whether sperm retrieval may be possible, a specialist assessment can help determine the most appropriate treatment approach.
Book a consultation with Professor Amr Raheem to discuss micro-TESE, azoospermia and surgical sperm retrieval.
References
European Society for Sexual Medicine (ESSM). 16th ESSM Congress Joint with the 12th EFS Congress – Final Programme, Istanbul, 2014. The programme includes sessions addressing micro-TESE, predictors of sperm retrieval in non-obstructive azoospermia and management following failed micro-TESE. ESSM 2014 Congress Programme
European Association of Urology (EAU). EAU Guidelines on Sexual and Reproductive Health – Male Infertility. Guidance on evaluation of azoospermia, genetic testing and surgical sperm retrieval. EAU Male Infertility Guidelines
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