Microdissection testicular sperm extraction (micro-TESE) is a microscope-guided operation used to search for sperm in selected men with non-obstructive azoospermia (NOA). In NOA, sperm production is severely reduced or occurs only in small, scattered areas of the testicle, so no sperm are found in the ejaculate after appropriate laboratory examination.
Micro-TESE uses an operating microscope to examine seminiferous tubules and selectively sample those that appear more likely to contain sperm. Current European and American male-infertility guidance supports micro-TESE as the preferred surgical retrieval approach for men with NOA who are suitable candidates.
Micro-TESE expertise with Dr. Arun Muthuvel in Chennai
Dr. Arun Muthuvel is an MCh-qualified reproductive medicine and surgery specialist in Chennai. His micro-TESE approach combines NOA diagnosis, genetic and hormonal evaluation, microscope-guided surgery, testicular blood-vessel preservation, real-time embryology support, and coordination with the female partner’s IVF-ICSI cycle.
Micro-TESE expertise also means identifying men who should not undergo the operation, treating reversible causes before surgery when appropriate, counselling honestly about uncertainty, and planning what happens if sperm are or are not found.
What Is Non-Obstructive Azoospermia?
Azoospermia is confirmed when no sperm are found in the ejaculate, including after centrifugation and careful examination of the pellet. With NOA, the main problem is sperm production rather than a blockage in the ducts.
Possible causes include genetic conditions, Y-chromosome microdeletions, Klinefelter syndrome, previous chemotherapy or radiotherapy, severe testicular injury or infection, undescended testes, torsion, and some unexplained forms of testicular failure. Men with hypogonadotropic hypogonadism have a hormone-signal problem and may produce sperm after appropriate gonadotropin treatment, sometimes avoiding retrieval surgery.
Micro-TESE Is Not Usually for Obstructive Azoospermia
In obstructive azoospermia, sperm production is generally preserved but a blockage prevents sperm from reaching the semen. Less extensive techniques such as PESA, TESA, MESA, or conventional TESE may retrieve sperm, and reconstructive surgery may be an option. Micro-TESE is designed mainly for the patchy sperm production seen in NOA.
Who May Be Considered for Micro-TESE?
Micro-TESE may be considered when:
- NOA has been confirmed on repeat, properly processed semen analyses
- The evaluation suggests severely impaired or focal sperm production
- The couple understands that any retrieved sperm will generally require IVF-ICSI
- Relevant genetic testing and counselling have been completed
- Medical causes that can restore sperm production without surgery have been considered
- The potential benefit, surgical risks, costs, alternatives, and plan after an unsuccessful retrieval have been discussed
When Should Micro-TESE Not Be Performed?
Men with complete AZFa or AZFb Y-chromosome microdeletions should not undergo sperm-retrieval surgery because current evidence indicates that sperm will not be found. Genetic counselling is essential before making this decision.
Men with untreated hypogonadotropic hypogonadism should generally receive specialist hormone therapy intended to start sperm production rather than proceeding directly to micro-TESE. Surgery may also be deferred when health, anaesthesia, infection, or fertility-treatment factors make the timing unsafe or unsuitable.
Evaluation Before Micro-TESE
A complete evaluation helps confirm NOA, identify conditions relevant to the patient’s wider health, and avoid an operation with no realistic retrieval possibility. Dr. Arun Muthuvel may recommend:
- Two semen analyses with centrifugation and extended examination for rare sperm
- Medical, developmental, reproductive, treatment, and family history
- Examination of testicular size and the male reproductive tract
- FSH, LH, testosterone, and other hormone tests when indicated
- Karyotype and Y-chromosome microdeletion testing when appropriate
- Additional genetic testing based on the clinical history and phenotype
- Scrotal ultrasound and other investigations when clinically indicated
- Baseline counselling about testosterone levels and the possible need for follow-up after surgery
- Parallel fertility evaluation of the female partner before IVF-ICSI timing is finalised
A separate diagnostic testicular biopsy is not routinely recommended. Histology from a previous biopsy may provide information, but no preoperative blood test, scan, testicular size, or histology category can guarantee whether sperm will be found at micro-TESE.
Is Hormone Treatment Needed Before Micro-TESE?
Routine hormonal stimulation before micro-TESE has not been proven to improve sperm retrieval for all men with NOA and is not recommended as a standard one-size-fits-all step. Medicines such as hCG, aromatase inhibitors, or selective oestrogen receptor modulators may be considered only for specific endocrine findings after specialist assessment.
Testosterone injections, gels, or tablets can suppress sperm production and should not be started in a man seeking fertility without reproductive-specialist advice. A man already taking testosterone or anabolic steroids needs an individual recovery plan before surgery is considered.
How Is Micro-TESE Performed?
- Planning and anaesthesia: the surgical, embryology, freezing, IVF, and backup plans are confirmed. Micro-TESE is performed under an appropriate anaesthetic selected for the patient.
- Microsurgical exposure: the testicle is exposed through a scrotal incision while structures and blood supply are handled carefully.
- Microscope-guided search: the surgeon examines seminiferous tubules under magnification and selects small samples from tubules that look relatively more promising.
- Real-time laboratory examination: an embryologist processes each sample and searches for sperm while the operation continues.
- Targeted additional sampling: the search proceeds in a systematic manner and can extend to another area or the opposite testicle when clinically justified and included in consent.
- Closure: bleeding is controlled, testicular tissue and coverings are closed, and scrotal support is applied.
The aim is a thorough search with the least tissue disruption reasonably possible. The extent and duration vary because each testicle and diagnosis is different.
Why the Embryology Laboratory Is Essential
Micro-TESE is a combined surgical and laboratory procedure. An experienced embryologist must carefully separate tubules, examine multiple microscopic fields, and communicate findings to the surgeon. Immediate feedback helps focus the search and avoid taking additional tissue after enough usable sperm have been identified.
Dr. Arun Muthuvel coordinates the operative search with the IVF laboratory so that sperm identification, cryopreservation, egg retrieval, and ICSI planning are aligned.
Fresh or Frozen Micro-TESE Sperm?
Some centres coordinate micro-TESE with the female partner’s egg retrieval so sperm can be used fresh. Others perform retrieval first and freeze sperm if an adequate number of viable cells are found. Very small numbers of testicular sperm may not always tolerate freezing and thawing, while synchronised treatment can expose the female partner to an IVF cycle even if no sperm are recovered.
There is no universal strategy. The decision should consider the expected retrieval difficulty, previous surgery, female age and ovarian reserve, donor-sperm preferences, laboratory experience, and the couple’s wishes.
What Happens If Sperm Are Found?
Retrieved sperm are used for ICSI, in which an embryologist injects one selected sperm into each mature egg. Finding sperm is an important first step, but it does not guarantee fertilisation, a transferable embryo, pregnancy, or live birth. Outcomes also depend on sperm viability, female age, egg quality, embryo development, genetic factors, uterine health, and laboratory performance.
What Happens If No Sperm Are Found?
An unsuccessful micro-TESE can be emotionally difficult. The follow-up consultation should review the extent of the search, pathology when relevant, hormone monitoring, whether repeat surgery has any reasonable basis, and family-building alternatives. Options may include donor sperm, adoption, or deciding not to pursue further treatment, depending on the couple’s values.
A repeat micro-TESE is not automatically advisable. The cause of NOA, findings from the first operation, interval since surgery, baseline testicular function, female partner factors, and realistic chance of additional benefit must all be reconsidered.
Risks and Recovery
Possible risks include:
- Pain, bruising, swelling, or scrotal haematoma
- Infection or wound complications
- Scarring or damage to testicular tissue and blood vessels
- Temporary or persistent reduction in testosterone
- Testicular shrinkage or atrophy, which is uncommon
- Failure to retrieve sperm
Men with NOA may already have low testosterone before surgery. Appropriate baseline testing and follow-up are therefore important. Recovery instructions commonly include scrotal support, wound care, prescribed pain relief, and temporary restriction of exercise, lifting, and sexual activity.
Increasing swelling, severe pain, fever, persistent bleeding, wound discharge, or difficulty passing urine requires medical review.
Micro-TESE Compared With TESA and Conventional TESE
| Procedure | Method | Typical role |
|---|---|---|
| TESA | Blind needle aspiration | Mainly selected obstructive azoospermia; not recommended for NOA |
| Conventional TESE | Open extraction without microscope-guided tubule selection | Selected cases; less targeted for patchy NOA |
| Micro-TESE | Microscope-guided exploration and targeted sampling | Preferred surgical sperm-retrieval approach for NOA |
Frequently Asked Questions
What is the micro-TESE success rate?
There is no single rate that accurately applies to every patient. Results vary with the cause of NOA, genetics, prior treatment, surgical and laboratory experience, and how the study population was selected. A personalised consultation is more useful than relying on a headline percentage.
Can FSH or testicular size predict whether sperm will be found?
No available clinical or biochemical variable can reliably predict the result on its own. High FSH or small testes do not necessarily prove that retrieval will fail, while favourable measurements cannot guarantee success.
Can micro-TESE be done after a failed conventional TESE?
It may be considered in selected men, but the original diagnosis, operative and pathology findings, genetic results, remaining testicular function, and partner factors need review. A prior failure does not automatically justify or rule out another operation.
Is micro-TESE painful?
The operation is performed under anaesthesia. Postoperative soreness and swelling are expected and managed with prescribed pain relief, support, and activity restrictions. Recovery varies with the extent of surgery and individual factors.
Why consult Dr. Arun Muthuvel for micro-TESE in Chennai?
Dr. Arun Muthuvel’s MCh training in reproductive medicine and surgery enables him to integrate microsurgical sperm retrieval with NOA diagnosis, genetics, hormone assessment, testicular preservation, embryology, female fertility evaluation, and IVF-ICSI planning. This full-pathway approach is central to responsible micro-TESE care.
The Bottom Line
Micro-TESE is the preferred surgical sperm-retrieval technique for appropriately selected men with non-obstructive azoospermia, but it cannot guarantee sperm or pregnancy. Dr. Arun Muthuvel provides specialist micro-TESE evaluation and IVF-ICSI coordination in Chennai, with emphasis on genetic safety, targeted microsurgery, tissue preservation, and honest outcome counselling.
This article provides general medical information and does not replace individual diagnosis, genetic counselling, consent, or surgical advice. Sperm-retrieval and IVF outcomes vary with male diagnosis, female factors, laboratory performance, and clinical circumstances.