What Happens If an Adenoma Is Not Removed?

The question “What happens if an adenoma is not removed?” is one of the main concerns for patients diagnosed with a pituitary adenoma. Although adenomas are usually benign tumors, when they originate from the pituitary gland—the center of hormonal regulation—their effects can be serious. Leaving an adenoma untreated does not simply mean tumor growth; it can lead to long-term problems affecting the entire body.

Pituitary adenomas do not follow the same course in every patient. Some remain silent for years, while others may quickly cause severe hormonal imbalances and neurological damage. Therefore, the risks of not removing an adenoma depend on its type, size, and hormonal activity.

Prof. Dr. Ömür Günaldı, an experienced neurosurgeon, emphasizes that even though pituitary adenomas are benign, they should not be underestimated, as untreated cases may lead to serious consequences.

What is a Pituitary Adenoma and Why is it Important?

Role of the Pituitary Gland
The pituitary gland is a vital organ located at the base of the brain and acts as the main control center of the endocrine system. It regulates growth, metabolism, reproduction, stress response, water balance, and milk production.

For this reason, an adenoma in the pituitary gland should be considered a systemic condition rather than just a localized tumor.

Are Adenomas Always Harmless?
Most pituitary adenomas are benign and do not become cancerous. However, this does not mean they are harmless. Due to their ability to produce hormones or compress surrounding tissues, they can cause significant health issues.

General Risks If an Adenoma Is Not Treated

Tumor Growth Over Time
Untreated adenomas often tend to grow. A small adenoma may gradually become a macroadenoma, compressing brain structures. This growth can be silent and go unnoticed for a long time.

As the tumor enlarges, it may compress the optic nerves, leading to permanent vision loss.

Progressive Hormonal Imbalance
If left untreated, hormone secretion can become increasingly uncontrolled. Hormone excess or deficiency may cause long-term damage to organs and body systems.

What Happens If a Hormone-Secreting Adenoma Is Not Removed?

Prolactin-Secreting Adenomas
Untreated prolactinomas can cause permanent menstrual irregularities, infertility, and milk discharge in women. In men, they may lead to low testosterone, reduced libido, and decreased bone density.

Long-term elevated prolactin levels increase the risk of osteoporosis in both men and women.

Growth Hormone-Secreting Adenomas
If untreated, these tumors lead to progressive acromegaly. Enlargement of the hands and feet, facial changes, and joint deformities may become permanent. There is also a significant increase in the risk of heart disease, hypertension, and diabetes.

Both life expectancy and quality of life may be negatively affected.

ACTH-Secreting Adenomas
These tumors cause excess cortisol production, leading to Cushing’s disease. Untreated cases may result in rapid weight gain, muscle wasting, bone fractures, increased infection risk, and serious cardiovascular diseases.

What Happens If a Non-Functioning Adenoma Is Not Removed?

Silent but Progressive Risk
Non-functioning adenomas may not cause symptoms for a long time. However, they can grow silently and compress nearby structures such as optic nerves and blood vessels.

By the time symptoms appear, damage is often already advanced.

Risk of Vision Loss
Due to the anatomical location of the pituitary gland, growing tumors often affect the optic nerves first. This can lead to visual field loss, double vision, and blurred vision. If treatment is delayed, these changes may become permanent.

Can Neurological Problems Develop?

Headaches and Increased Intracranial Pressure
As the tumor grows, it may increase intracranial pressure, causing persistent and severe headaches that interfere with daily life.

Rare but Serious Complications
In advanced cases, patients may experience altered consciousness, balance problems, or sudden vision loss. Rarely, a condition called pituitary apoplexy (sudden bleeding into the tumor) may occur, requiring emergency intervention.

Is There a Life-Threatening Risk?
Pituitary adenomas do not spread like cancer, but their indirect effects can be life-threatening. Hormonal disorders may lead to heart disease, diabetes, and infections. Conditions such as Cushing’s disease and acromegaly can shorten life expectancy if untreated.

Prof. Dr. Ömür Günaldı highlights that the indirect effects of adenomas can sometimes be more dangerous than the tumor itself.

Psychological and Social Effects

Emotional Changes
Hormonal imbalances may cause depression, anxiety, and mood swings. Patients may feel constantly fatigued and unmotivated.

Impact on Daily Life
Vision problems, fatigue, and concentration difficulties can reduce work performance and lead to social withdrawal, significantly lowering quality of life.

Is Follow-Up Alone Enough?
Some small, non-functioning adenomas can be monitored with regular follow-up. However, this decision must be made by a specialist. Without regular MRI scans and hormone tests, it is impossible to predict the tumor’s behavior.

When Must an Adenoma Be Removed?

• If there is vision loss
• If rapid tumor growth is detected
• If hormone secretion cannot be controlled
• If there is no response to medical treatment

In these cases, surgery should not be delayed.

The answer to “What happens if an adenoma is not removed?” is complex and cannot be overlooked. Untreated pituitary adenomas may grow over time, leading to permanent vision loss, severe hormonal disorders, and life-threatening systemic conditions. Early diagnosis, proper treatment, and regular follow-up can significantly reduce these risks. As Prof. Dr. Ömür Günaldı emphasizes, pituitary adenomas should not be neglected but can be effectively managed with the right approach.