Can the Presence of Sperm in the Testis Be Predicted Before Micro-TESE?

Micro-TESE surgery, a procedure conducted by Urology/Andrology specialists, is essential for identifying the presence of sperm in men with sperm production failure. This method meticulously examines the tubules, which are the sperm-producing channels in the testicular tissue. It is particularly useful for men with structural abnormalities in the testes, such as undescended testicles, congenital azoospermia (like Y chromosome microdeletion), or those who have undergone chemotherapy and radiotherapy, which can disrupt sperm production.

An operating microscope is used during micro-TESE to magnify the view, enabling the identification and selection of tubules with normal or large diameters that are more likely to contain viable sperm.

In the case of men with Klinefelter syndrome, and other azoospermic conditions where no sperm is present in the semen, a series of evaluations are conducted prior to the micro-TESE surgery. These assessments aim to determine whether factors such as testicular size, hormone levels, pre-operative medications, and the patient's age play a significant role in the likelihood of finding sperm during the surgery. The importance of these factors in successfully locating sperm in men with or without sperm production is a key focus of these pre-surgical evaluations

Does Testis Size Have an Importance in Finding Sperm?  

In cases where couples are facing sperm production disorders or unexplained infertility issues, it's crucial for men to undergo a thorough medical evaluation, ideally by a Urology/Andrology Specialist. This assessment includes a general physical examination, checking for breast enlargement, and a detailed genital examination. Testicular size is a significant focus during this examination. Normally, testicular volume is around 20 mL, but in men with sperm production disorders, it tends to be smaller, averaging between 8-10 mL.

In azoospermic men with Klinefelter syndrome, testicular sizes are often considerably below the normal range, typically between 2-4 mL. Some studies with smaller participant groups have suggested that men with normal or near-normal testicular volumes have a higher likelihood of successful sperm retrieval through MicroTESE surgery. However, larger-scale studies indicate that testicular size doesn't significantly impact the success rate of finding sperm in men with azoospermia due to sperm production disorders.

Notably, even though men with Klinefelter syndrome generally have much smaller testicles, their success rates in sperm recovery through Micro-TESE are comparable to those of men with other causes of sperm production disorders and relatively normal testicular sizes. In large series studies, the probability of finding sperm in men with Klinefelter syndrome using Micro-TESE averages around 50%.

Do Hormone Levels Show the Presence of Sperm?

"FSH (Follicle Stimulating Hormone) Levels: This hormone, produced by the pituitary gland, is also known as gonadotropin. In men with Klinefelter syndrome, FSH levels are typically very high. Despite these elevated FSH levels, the success rate of finding sperm through Micro-TESE surgery is currently around 50%. Furthermore, extensive analyses in large case studies have revealed no significant differences in FSH levels between men who do and do not have sperm. Consequently, an elevation in FSH values neither indicates the presence nor absence of sperm, nor does it impact the success rate of sperm retrieval with Micro-TESE.

The chart below provides a comparative analysis of sperm retrieval success relative to FSH values based on Micro-TESE results from over 700 azoospermic men with sperm production disorders treated at Cornell University in New York. Notably, the lowest success rates in sperm retrieval were found in men with FSH values of 15 or lower, a statistically significant finding. Conversely, the highest success rates were observed in men with FSH values ranging from 31-45."

LH (Luteinizing Hormone) Levels: LH, another hormone secreted by the pituitary gland, falls under the category of gonadotropins. It plays a key role in regulating the production of male hormones (androgens). Typically, LH levels increase in response to insufficient secretion of male hormones or due to structural issues in the testicles. In men with Klinefelter syndrome, it is common to observe elevated LH levels. However, studies indicate that an increase in LH does not reliably predict the presence or absence of sperm within the testicles.

Male Hormone Levels: The level of male hormones, particularly testo****ne, is crucial for sperm production. In some individuals with Klinefelter Syndrome, these hormone levels may be lower than normal. Hormone therapies aimed at boosting the production of male hormones, or those preventing their conversion to estradiol, might enhance sperm production within the testes. For men who have received supplemental male hormones either during adolescence or in adulthood, it is recommended to discontinue these treatments before undergoing surgical procedures for sperm retrieval from the testis. Research has shown that previous male hormone treatments do not adversely impact the success rate of sperm retrieval.

Is the Age of Men with Klinefelter Syndrome Important in Finding Sperm?

The impact of age on the success of sperm retrieval in men with Klinefelter syndrome has been a topic of research, as evidenced by studies published in the Fertility and Sterility Journal in 2005 and the UROLOGY Journal in 2006. The first study examined 51 cases, while the second assessed 74 cases of men with classic Klinefelter syndrome. These studies found that the likelihood of successful sperm retrieval from testicular tissue significantly declines with age. However, factors such as FSH levels, male hormone values, and testicular size did not show a notable impact on sperm retrieval outcomes.

The success of Micro-TESE surgeries is also heavily influenced by the experience and technique of the specialist conducting the procedure. This is crucial in detecting the presence of sperm in the testicular tissue. For example, of 14 men with Klinefelter syndrome who initially underwent unsuccessful Micro-TESE operations at different centers, a subsequent attempt by a different specialist resulted in successful sperm retrieval in 7 cases. This underscores the significance of the surgeon's expertise and the specific surgical techniques employed during the procedure. Additionally, the methodologies used in the examination of small samples in the IVF laboratory are critical for detecting sperm.

The accompanying image illustrates a MicroTESE procedure being performed on a patient with Klinefelter syndrome. The tissue is magnified around 24 times, allowing for the precise selection of tubules - the channels where sperm production occurs - from a small area at the tip of the forceps. Despite their millimetric size, these tubules were found to contain sperm when dissected in the laboratory. This visual representation highlights the intricate nature of the procedure and the level of detail required for successful sperm retrieval in men with Klinefelter syndrome.

Micro-TESE is also a preferred surgical technique in other non-obstructive azoospermia cases where no sperm is found in the semen sample. Micro-TESE method is used in the treatment of azoospermic men due to sperm production disorders to obtain sperm and increase the chance of having a child through in vitro fertilization.

The success of Micro-TESE depends on various factors, including the underlying cause of azoospermia, the expertise of the surgeon, and the quality of the IVF laboratory's procedures. However, it offers a valuable opportunity for many couples dealing with male factor infertility to achieve pregnancy.