What are pituitary tumors?
The pituitary gland, also known as the "master gland," is a small, pea-sized organ located at the base of the brain, behind the nose. Its function is to produce hormones that regulate other glands in the body (thyroid, adrenal glands, testes) and control vital functions such as growth, blood pressure, reproduction, and stress.
A pituitary tumor is an abnormal growth of cells within the pituitary gland. Most are benign and are called adenomas. Pituitary carcinomas (malignant) are extremely rare. Although benign, these tumors can cause problems by producing excess hormones or by growing and compressing nearby structures.
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Functioning (secretory) adenomas
They produce an excess of one or more hormones. Prolactinomas secrete excess prolactin, somatotrophs secrete excess growth hormone, and corticotrophs secrete excess ACTH, which causes Cushing's disease.
Thyrotrophs, which are very rare, secrete an excess of TSH, which can produce secondary hyperthyroidism; gonadotrophs secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH), and do not cause specific symptoms; and mixed ones secrete more than one type of hormone, frequently GH and PRL.
Non-functioning (non-secreting) adenomas
They do not produce an excess of active hormones, they usually grow undetected until they reach a considerable size and begin to cause symptoms due to compression.
Aggressive tumors and carcinomas
An atypical adenoma is a tumor with more aggressive characteristics; aggressive adenomas are tumors that, despite treatment, persist and grow, being difficult to control; and pituitary carcinoma, extremely rare (<0.2%), is diagnosed when the tumor produces distant metastases.
Classification according to their size
Microadenomas
These tumors are less than 1 centimeter in diameter. They are often incidental findings on MRI scans performed for other reasons and can cause significant hormonal changes from early stages.
Macroadenomas
These are tumors equal to or greater than 1 centimeter, more likely to exert a mass effect, compressing the optic chiasm (causing vision loss), healthy pituitary tissue, and other structures.
Clinical significance of size
In macroadenomas, the erectile dysfunction Loss of libido is very common due to the mass effect. In giant tumors, compression of the pituitary stalk almost universally affects sexual function. In microadenomas, sexual symptoms are primarily due to hormonal imbalance.
How do they affect male sexual health?
Hyperprolactinemia and testosterone suppression
Excess prolactin acts on the hypothalamus. It inhibits the release of GnRH, which in turn decreases the production of LH and FSH by the pituitary gland. Without the LH signal, the testes drastically reduce their production of testosteroneleading to secondary hypogonadism.
Inhibition of the HHT axis
The hypothalamus releases GnRH, the pituitary gland releases LH and FSH; in the testes, LH stimulates Leydig cells to produce testosterone. FSH is key for sperm production.
Tumors disrupt this communication, either by excess prolactin (which inhibits GnRH) or by physical compression of the stalk or glandular tissue.
Physical compression of pituitary tissue
Macroadenomas and large tumors can compress and damage healthy pituitary cells that produce LH and FSH. This can destroy tissue and lead to insufficient production of one or more pituitary hormones. Hypogonadism is the most common manifestation of this compression.
Specific sexual symptoms in men with pituitary tumors
Erectile dysfunction
This is due to a combination of low testosterone levels and, sometimes, the psychological impact of the diagnosis. It is found in 78-100% of men with large prolactinomas.
Decreased libido
La testosterone It is the main driver of male libido, so its decrease dampens sexual desire.
Male infertility
Alteration of the HHT axis, whether due to hyperprolactinemia or compression, can drastically reduce sperm quality and quantity, leading to infertility.
Gynecomastia
Breast tissue development in men can occur due to a hormonal imbalance, although it is less common than other symptoms. There may also be milk secretion from the nipple.
hypopituitarism
When the tumor compresses the gland, other vital hormones (GH, TSH, ACTH) also stop being produced, causing fatigue, weakness and further deterioration of health.
Altered ejaculation
It can present as retrograde ejaculation, decreased ejaculatory volume, or anejaculation, due to low testosterone and local neurological alteration in cases of very large tumors.
Other associated symptoms
Headaches, visual problems due to compression of the optic chiasm, symptoms of hyperprolactinemia, symptoms of acromegaly (growth of hands, feet and facial features, snoring, joint pain), symptoms of Cushing's (weight gain with fat redistribution, purple stretch marks, hypertension, diabetes, easy bruising), symptoms of secondary hypothyroidism (fatigue, cold intolerance, constipation, weight gain) and symptoms of secondary adrenal insufficiency (extreme fatigue, low blood pressure, dizziness).
Diagnosis: How is the problem detected?
The diagnosis is multidisciplinary and follows a standardized process, beginning with a detailed clinical evaluation by an endocrinologist or neurologist, and a blood test to measure hormone levels, including: prolactin, total and free testosterone, LH, FSH, GH, IGF-1, ACTH, cortisol, and TSH.
A brain MRI focused on the pituitary gland and using contrast (gadolinium) allows visualization of the tumor, determination of its exact size and location, and whether it is compressing neighboring structures. An ophthalmological examination is also performed to detect any loss of peripheral vision caused by compression of the optic chiasm.
Pituitary tumors and male fertility
Fertility is severely affected because proper sperm maturation in the testicles is impaired. Furthermore, the low testosterone levels necessary for a healthy testicular environment exacerbate the problem. Hyperprolactinemia also has a direct inhibitory effect on testicular function. In many cases, treating the tumor can restore the hormonal axis and recover fertility.
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Treatment of pituitary tumors and sexual recovery
The goal of treatment is to eliminate or control the tumor and restore hormonal balance to relieve symptoms. Recovery of sexual function is a process that can take time.
Pharmaceutical products
It is the first-line treatment for prolactinomas, using dopaminergic agonists (such as Cabergoline or Bromocriptine), which mimic the action of dopamine to inhibit prolactin secretion, effective in normalizing prolactin levels, reducing tumor size, and restoring testicular function and libido.
Surgery
It is the treatment of choice for most other functioning tumors (acromegaly, Cushing's) and for large non-functioning tumors that compress structures.
Endoscopic transsphenoidal surgery is the most modern and least invasive approach. The surgeon inserts an endoscope through the nostrils, down to the base of the skull, and removes the tumor. However, the surgery can damage healthy tissue, and the recovery of gonadal function varies. After surgery, 17–26% of men experience improved gonadal function, while a small percentage (14%) may experience a decline.
Radiotherapy
It is reserved for residual or recurrent tumors that do not respond to medication or surgery. It may involve conventional radiotherapy in fractionated doses over several weeks or radiosurgery in a single, highly concentrated dose.
It is effective in controlling tumor growth, but its effect on hormonal function is slow and carries a significant risk of causing long-term hypopituitarism.
Hormone Replacement Therapy
It is a fundamental pillar for patients who develop hypopituitarism after the tumor or its treatment.
If testosterone levels remain low after treating the tumor, testosterone replacement therapy is administered, which improves libido, erectile dysfunction, and muscle mass.
Thyroid hormones, cortisol, and growth hormone may be needed.
Prognosis for sexual health after treatment
The prognosis is generally favorable, depending on the type of tumor, its size and damage, since in macroadenomas with great compression, the damage to healthy tissue can be irreversible, making lifelong hormone replacement therapy necessary.
It also depends on the treatment (surgery or radiotherapy) and the time it takes, because even with normal testosterone levels, it can take months to regain confidence and full sexual function.
Frequently Asked Questions (FAQs)
What does prolactin have to do with sexual relations?
Excessive prolactin is a potent inhibitor of male sexual desire and function, shutting down testosterone production by blocking signals from the brain to the testicles.
Can a pituitary tumor disappear?
Yes, in some cases. Prolactinomas treated with dopamine agonists can significantly reduce in size and even disappear completely on MRI scans, achieving remission.
What effects can a pituitary tumor cause?
It can cause everything from visual symptoms and headaches to complex hormonal imbalances that impact multiple body systems: sexual (impotence, infertility), metabolic (diabetes, obesity, osteoporosis), cardiovascular (hypertension) and psychological (depression, anxiety).
Is it possible to live with a pituitary tumor?
Yes. Most pituitary tumors are benign and slow-growing. With proper diagnosis and personalized treatment, most patients lead normal lives, always with regular medical follow-up.
Is pituitary tumor hereditary?
In the vast majority of cases (over 95%), pituitary tumors are sporadic, meaning they are not inherited or passed on to children. However, there are very rare genetic syndromes, such as Multiple Endocrine Neoplasia type 1 (MEN1), that increase the risk of developing pituitary tumors and can occur in several generations of a family.
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Conclusion
Pituitary tumors pose a significant challenge to male sexual health, but they are not a death sentence. It is essential to consult a doctor for any persistent sexual symptoms to ensure early diagnosis and allow for a better quality of life.
En Doctor T Clinics We do not directly treat this type of pathologies, but if you are noticing chronic fatigue, lack of motivation, problems sleeping, or low libido, it is possible that the origin is a hormonal imbalance, such as a testosterone low.
We offer you tools to detect it early and, if necessary, initiate specialized medical treatment:
- Online Testosterone Test, where we will evaluate with this quick and free test if you have low testosterone or high testosterone in men with this simple, convenient test without leaving home.
- Testosterone Replacement Therapy (TRT), Indicated in cases of primary hypogonadism or secondary hypogonadism, it helps to recover your vitality, sexual energy and general well-being.
If you are looking for answers and a professional team that will listen to you, Doctor T Clinic is the right place. Schedule your appointment and start your recovery now!
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