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A prolactinoma is the most common functioning pituitary tumour — and it is benign. Most are controlled with tablets that lower prolactin and shrink the tumour. CION coordinates the hormone tests, MRI and expert review that get you the right plan.
Hearing the word "tumour" near the brain is frightening. But a prolactinoma is one of the most reassuring diagnoses in this space. It is a benign (non-cancerous) growth of the pituitary gland — the pea-sized gland at the base of the brain that runs your hormones. It is the most common type of pituitary adenoma, and most people are treated successfully with tablets, never needing surgery.
The trouble a prolactinoma causes is hormonal. It makes too much prolactin, the hormone behind breast-milk production. In women this disrupts periods and fertility; in men it lowers libido and energy. Larger tumours can also press on nearby structures. The good news is that lowering prolactin usually reverses these problems — and that is what treatment is built around.
Prolactinomas are unusual among brain and pituitary tumours: medicine is the first-line treatment, even for large ones. The Endocrine Society clinical practice guideline recommends dopamine agonist tablets — not surgery — as the preferred initial therapy for prolactinomas, because they both lower prolactin and shrink the tumour in the majority of patients.
High prolactin has several common, non-tumour causes — pregnancy, an underactive thyroid, stress, and some everyday medicines (certain antipsychotics, anti-sickness drugs and acid-reducers). A prolactinoma is one of the less common causes, but it is the one worth checking for, because a simple blood test can confirm or rule it out. The signs differ between women and men.
Because symptoms show up early, women are usually diagnosed when the tumour is still small.
Symptoms are quieter and easy to miss, so men are sometimes diagnosed later, with a larger tumour.
When to act sooner: a larger prolactinoma (a macroadenoma) can press on the optic nerves and cause loss of side vision, or trigger a persistent new headache. New, progressive vision loss should be assessed promptly. If you recognise these patterns, speak to a CION specialist — most of these symptoms are treatable once prolactin is brought down.
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Whether you've just been told your prolactin is high, want to know if medicine alone is enough, or are weighing surgery — CION's team will review your reports and explain your options clearly.
One of the simplest things about a prolactinoma is the diagnosis. Unlike most brain tumours, it does not need a biopsy. The diagnosis rests on two pieces of evidence that fit together.
A simple blood test measures prolactin. A markedly high level points strongly to a prolactinoma. Before confirming, your doctor rules out the common, harmless causes of mildly raised prolactin — pregnancy, an underactive thyroid, and several everyday medicines. The size of the tumour usually tracks with how high the prolactin is, which helps interpret the result.
A focused MRI of the pituitary, usually with contrast, shows the adenoma — its size, exact location, and whether it is touching the optic nerves. Tumours are described as microadenomas (under 10mm) or macroadenomas (10mm or larger). If the tumour is large, a simple visual-field test checks your side vision.
CION coordinates the prolactin panel, the pituitary MRI review and a full endocrine work-up — including thyroid and other pituitary hormones — so the diagnosis is complete and accurate before any treatment is chosen. This is part of the wider brain and pituitary tumour care pathway.
For almost everyone, treatment begins with medicine, not surgery. This is what makes prolactinomas different from other pituitary tumours.
The pituitary's prolactin output is normally held in check by dopamine. Dopamine agonists — a drug class that mimics dopamine — switch off the excess prolactin and, in most people, shrink the tumour as well. Periods return, fertility is often restored, and vision usually recovers if it was affected. The Endocrine Society recommends this as the preferred first treatment even for large prolactinomas. Treatment is taken as tablets, and prolactin levels and MRI are monitored over time; some people can eventually reduce or stop the medicine under specialist supervision.
Surgery is reserved for the minority of cases: people who cannot tolerate the medicine, tumours that do not respond, or a sudden complication threatening vision. It is done through the nose — trans-sphenoidal surgery — without opening the skull. At CION this surgery is coordinated with accredited neurosurgical partners; CION does not perform neurosurgery in-house, but manages the endocrine work-up, the multidisciplinary plan, and your follow-up care around it.
For the rare prolactinoma that resists both medicine and surgery, or behaves aggressively, radiation therapy (IMRT/IGRT) can control the tumour. This is delivered directly by CION's radiation oncology team. Highly focused radiosurgery, when indicated, is arranged as part of coordinated specialist care.
Explore CION's full brain & pituitary tumour treatment for how surgery, radiation and medical care are coordinated under one tumour board.
A functioning pituitary tumour is one that overproduces a hormone. Prolactinomas are the most common, but two other types matter — and unlike prolactinomas, both are usually treated with surgery first (coordinated with neurosurgical partners), with medicine and radiation added as needed.
Caused by a tumour making too much growth hormone. Over years it gradually enlarges the hands, feet and facial features, and can affect the heart and joints. Diagnosed with hormone testing and MRI. Treated with surgery, then medicine and sometimes radiation to bring growth hormone back to normal.
Caused by a tumour making too much ACTH, which drives the body to overproduce cortisol. Signs include weight gain around the trunk and face, high blood pressure, easy bruising and muscle weakness. Treated mainly with surgery, supported by medicine and radiation when needed.
Not all pituitary tumours overproduce a hormone — many are non-functioning and are found because of pressure symptoms or by chance on a scan. Read more about the wider family of pituitary adenomas and how they are assessed and managed.
High prolactin is one of the most common reversible causes of infertility. Lowering it with medicine often restores ovulation and normal periods, so many women with a prolactinoma can go on to conceive. Pregnancy raises prolactin naturally, so your endocrinologist plans monitoring before and during pregnancy — a well-trodden, manageable pathway.
A prolactinoma diagnosis is rarely an emergency, which means you have time to make sure the plan is right. A second opinion is especially worthwhile if:
CION offers a free, 45-minute consultation and a free written second opinion — decisions for healing, not billing. Book your prolactinoma review or call 18002028726 to speak to a specialist today.
Most prolactinomas are managed with medicine alone. Get a free written second opinion from CION's tumour board before committing to any procedure.
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Start Your Story. Book Free Consultation.No. A prolactinoma is the most common type of pituitary adenoma — a benign (non-cancerous) growth of the pituitary gland that produces too much of the hormone prolactin. It does not spread to other parts of the body the way cancer does. Most prolactinomas are small (called microadenomas, under 10mm) and respond very well to medicine. The reason they need attention is hormonal: high prolactin disrupts menstrual periods, fertility and libido, and large tumours can press on the optic nerves. According to the Endocrine Society, the majority of people with a prolactinoma are managed with tablets alone and never need surgery.
Symptoms come from too much prolactin and, in larger tumours, from local pressure. In women, the earliest signs are usually irregular or absent periods, difficulty getting pregnant, and sometimes a milky breast discharge (galactorrhoea) when not breastfeeding. In men, the signs are quieter and often missed for years — low libido, erectile difficulty, reduced energy, and sometimes breast tenderness. Larger tumours (macroadenomas) can press on the optic nerves and cause loss of side vision or persistent headaches. Many of these symptoms have common, non-tumour causes — but a simple blood prolactin test can clarify the picture.
Diagnosis is usually straightforward and does not need a biopsy. It rests on two things: a blood test showing a high prolactin level and an MRI of the pituitary showing the adenoma. A markedly raised prolactin together with a visible pituitary tumour confirms a prolactinoma. Your doctor will first rule out other causes of high prolactin — pregnancy, an underactive thyroid, and several common medicines (some antipsychotics, anti-sickness drugs and acid-reducers). If the tumour is large, a visual-field test checks whether it is affecting the optic nerves. CION coordinates the prolactin panel, pituitary MRI and endocrine work-up so the diagnosis is complete before any treatment decision.
Medicine is the first-line treatment for almost all prolactinomas — and this makes them unusual among pituitary tumours. Dopamine agonist tablets (a drug class that mimics dopamine) lower prolactin and often shrink the tumour, restoring periods and fertility without surgery. The Endocrine Society recommends medical therapy as the preferred initial treatment even for large prolactinomas. Surgery — performed through the nose (trans-sphenoidal) by an accredited neurosurgical partner — is reserved for people who cannot tolerate the medicine, whose tumour does not respond, or who have a sudden vision-threatening complication. Radiation therapy is a third-line option for rare resistant tumours.
A functioning pituitary tumour is one that overproduces a hormone. Besides prolactinomas (excess prolactin), the main types are growth-hormone-secreting tumours (causing acromegaly — enlarging hands, feet and facial features) and ACTH-secreting tumours (causing Cushing's disease — weight gain, high blood pressure, easy bruising). Unlike prolactinomas, these two are usually treated first with surgery to remove the tumour, with medicine and radiation as add-ons. The shared principle is the same: control the excess hormone and relieve any pressure on nearby structures. CION coordinates endocrine and radiation care for all functioning pituitary tumours, with surgery arranged through accredited neurosurgical partners.
In most cases, yes. High prolactin is a common, reversible cause of infertility — and lowering it with dopamine agonist medicine usually restores ovulation and normal periods, allowing pregnancy. Pregnancy itself raises prolactin and can cause a small prolactinoma to grow slightly, so your endocrinologist will plan monitoring before and during pregnancy and advise on whether and when to pause the medicine. Large tumours need closer watching during pregnancy because of the small risk of pressure on the optic nerves. This is a planned, well-trodden pathway — discuss your fertility goals early so your care is tailored to them.
Yes — CION provides coordinated care for prolactinomas and other functioning pituitary tumours. We deliver the parts that sit within oncology and endocrine medicine directly: the prolactin and hormone panels, the pituitary MRI review, medical management of hormone excess, and radiation therapy (IMRT/IGRT) when it is needed for resistant or aggressive tumours. Pituitary surgery, including trans-sphenoidal removal through the nose, is coordinated with accredited neurosurgical partners — CION does not perform neurosurgery in-house. Every case is reviewed by a tumour board so your plan reflects the full multidisciplinary view. You get a 45-minute consultation, transparent costs and a free second opinion.
Disclaimer: This content is intended for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified specialist for guidance specific to your medical condition. The information on this page is periodically reviewed and updated by CION's medical team in accordance with current clinical guidelines.
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