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On this page:
- What is a prolactinoma?
- How mutual are prolactinomas?
- Who is more likely to develop a prolactinoma?
- What are the complications of having a prolactinoma?
- What are the symptoms of having a prolactinoma?
- What causes prolactinomas?
- How practice doctors diagnose prolactinomas?
- How do doctors care for prolactinomas?
- How do doctors treat prolactinomas during pregnancy?
- Clinical Trials for Prolactinoma
What is a prolactinoma?
A prolactinoma is a beneficial (noncancerous) tumor of the pituitary gland that produces a hormone called prolactin. Located at the base of the brain, the pituitary is a pea-sized gland that controls the production of many hormones.
Prolactin signals a woman's breasts to produce milk during pregnancy and breastfeeding. Having besides much prolactin in the blood, a condition called hyperprolactinemia, tin crusade infertility and other bug. In most cases, prolactinomas and related health bug can be successfully treated with medicines.
The pituitary gland sits at the base of the brain.
How common are prolactinomas?
Small, benign pituitary tumors are adequately common in the general population. A prolactinoma is the most common type of pituitary tumor, making up about 40 percent of all pituitary tumors.1
Who is more than likely to develop a prolactinoma?
Women are more than probable than men to develop a prolactinoma. These tumors rarely occur in children and adolescents. In children, prolactinomas may prevent the start or block the progression of puberty.
Prolactinomas occur more oftentimes in women than men.
What are the complications of having a prolactinoma?
Having a prolactinoma can atomic number 82 to dissimilar symptoms and bug among women and men. Some of these are caused by having too much prolactin in the body, while others are linked to the size and location of the tumor.
Backlog prolactin, or hyperprolactinemia, tin lower levels of sexual practice hormones in both women and men. Related complications can include
- infertility
- bone loss (osteoporosis)
Prolactinomas are usually small, less than 1 centimeter in diameter. These minor tumors are chosen "microprolactinomas." Less commonly, a tumor may grow to more than than one centimeter in diameter. These larger tumors are called "macroprolactinomas." Macroprolactinomas may printing against nearby parts of the pituitary gland and the encephalon. Complications can include
- vision problems, caused when the tumor presses on the optic nerves or optic chiasm, the part of the brain where the two optic nerves cross over each other
- headaches
- low levels of other pituitary hormones, such as thyroid hormones and cortisol
What are the symptoms of having a prolactinoma?
Among women, common symptoms of having a prolactinoma include
- changes in menstruation, such as irregular periods or no periods
- infertility
- milky discharge from the breasts, also chosen galactorrhea
- loss of interest in sex
- pain or discomfort during sex due to vaginal dryness
Amidst men, mutual symptoms include
- loss of interest in sex associated with depression levels of testosterone
- erectile dysfunction
Women often report symptoms earlier than men because they may notice changes in their periods or milky discharge from their breasts when they are not significant or breastfeeding. But women who are taking sex hormones—in birth control pills or hormone replacement therapy—may not experience these changes.ii The same is true for women who accept reached menopause and no longer accept periods. Among these women, and amongst men, a lack of clear signs and symptoms may lead to a delayed diagnosis.
What causes prolactinomas?
Nigh pituitary tumors develop on their ain. The cause of these tumors is unknown. In some cases, genetic factors may play a role. For example, the inherited disorder multiple endocrine neoplasia type ane increases the take chances for prolactinomas.
What else can cause prolactin levels to rise?
Prolactin levels ordinarily rise during pregnancy and breastfeeding. They may also ascent slightly at other times because of1
- physical stress, such every bit a painful blood draw
- exercise
- a meal
- sexual intercourse
- nipple stimulation
- injury to the chest area
- epileptic seizures
These increases in prolactin are usually small and temporary. Other than a prolactinoma, the factors that most oftentimes atomic number 82 to excess prolactin in the blood are medicines, illnesses, and other pituitary tumors.
Medicines. The encephalon chemic dopamine helps adjourn the production of prolactin in the trunk. Whatever medicine that affects the product or use of dopamine can brand prolactin levels ascension.
Medicines that can increment prolactin levels include some types of
- antipsychotic medicines, such as risperidone, just not others, such every bit clozapine3
- high blood pressure medicines
- drugs used to care for nausea and vomiting
- hurting relievers that incorporate opioids
Although the hormone estrogen stimulates the release of prolactin, estrogen-containing nascence control pills and hormone replacement therapy accept not been found to cause hyperprolactinemia.4
If loftier prolactin levels are because of a medicine, these levels will usually return to normal 3 to four days later the drug is stopped.
Other illnesses. Illnesses that may increase prolactin levels include
- kidney affliction
- an underactive thyroid, or hypothyroidism
- shingles—particularly when lesions touch on your chest
Other pituitary tumors. Other large tumors located in or nigh the pituitary gland may also enhance prolactin levels, usually by preventing dopamine from reaching the pituitary gland.
Sometimes the cause of excess prolactin is unknown.
How do doctors diagnose prolactinomas?
Doctors diagnose prolactinomas based on the results of two tests
- Blood exam. The prolactin blood exam will measure the level of prolactin in your blood. If the level is too high, your physician will order an imaging exam to detect a possible tumor.
- Imaging tests. The preferred exam is the magnetic resonance imaging (MRI) scan, which uses radio waves and magnets to create detailed images of your internal organs and soft tissues without x-rays. If an MRI is not a good option for you (for case, if y'all have a pacemaker or other implant that has metal), your doctor may order a computed tomography (CT) browse instead. The results of the imaging test ordinarily will allow your doctor to confirm a diagnosis of prolactinoma and decide its size and location.
A blood exam is used to observe high levels of prolactin.
After confirming the prolactinoma diagnosis, your doctor may behave other tests to find out if the tumor is affecting other hormones. Depending on the tumor'due south size, your doctor may also ask y'all to take a vision examination.
How exercise doctors treat prolactinomas?
Doctors commonly treat prolactinomas with medicines. More than rarely, surgery or radiation therapy may be used. The goals of treatment are to
- bring prolactin levels dorsum to normal
- compress the tumor
- brand sure the pituitary gland is working properly
- correct whatever problems acquired by the tumor, such as menstrual problems, milky discharge from the breasts, low testosterone levels, headaches, or vision problems
Medicines
Medicines chosen dopamine agonists control prolactin levels and shrink the tumor very effectively. These drugs mimic the furnishings of the encephalon chemical dopamine.
Two dopamine agonists are most unremarkably used to treat prolactinomas
- bromocriptine, a drug that must exist taken twice or three times daily
- cabergoline, a drug that can exist taken once or twice per week
Cabergoline is the preferred drug for treating prolactinomas, because it is more effective than bromocriptine and has fewer side furnishings.1
Outcomes. For most small prolactinomas, dopamine agonists bring prolactin levels back to normal and compress tumors in iv out of 5 patients.5
Side furnishings. Common side effects of the drugs include nausea, vomiting, and dizziness. Both medicines should e'er be taken with food. Starting handling at a depression dose and taking the medicine at bedtime tin reduce side effects.
Complications. Although dopamine agonists have been linked to center valve damage, these bug were found mainly among people taking these medicines to care for Parkinson'south illness. These patients typically take much higher doses (commonly about 10 times college) of these medicines than are used to treat prolactinomas. If you need to take a high dose of a dopamine agonist, your physician may order an echocardiogram (echo) to cheque your heart valves and centre part. Rarely, psychiatric disorders related to impulse command, such as compulsive gambling, have been seen in people taking these medicines.6
Duration of treatment. You may have to take these medicines for a long fourth dimension to foreclose the tumor from growing back, particularly if the prolactinoma is big. After 2 years, the medicines may be slowly reduced and stopped if prolactin levels are normal and the tumor is no longer visible.i But if your prolactin level goes back up over again, you may need to get back on the medicine for as long equally needed to bring your prolactin level under control.
Surgery
Although doctors most oft treat prolactinomas with medicines, in some cases surgery may be an option. Examples include
- you can't tolerate the medicines
- the medicines aren't working for y'all
- you accept antipsychotic medicines that collaborate with the medicines used to treat prolactinomas
In some cases, when a prolactinoma is large, a woman may choose to have surgery to remove the tumor before trying to become significant.
Ii types of surgery may exist used
- Transsphenoidal surgery is most unremarkably used to treat prolactinoma. The surgery is done through an incision, or cut, at the back of the nasal crenel or under the upper lip.
- Transcranial surgery is used more than rarely if the tumor is big or has spread to other areas. The surgeon removes the tumor through an opening in the skull.
Outcomes. The success of the surgery depends on many factors, including
- skill and experience of the surgeon
- size and location of the tumor
When washed by an experienced surgeon, the surgery corrects prolactin levels in virtually 90 per centum of people with small tumors and 50 percent of those with large tumors.7 For people with larger prolactinomas that tin can only be partly removed, medicines ofttimes can return prolactin levels to a normal range after surgery.
Side effects and complications. Side effects of the surgery can include
- depression pituitary function, or hypopituitarism
- temporary diabetes insipidus, a condition that leads to frequent urination and excessive thirst
- cerebrospinal fluid leak
- local infection
Radiation
More rarely, if medicines and surgery fail to reduce prolactin levels, radiations therapy may be used. This type of treatment uses high-energy x-rays or particle waves to kill tumor cells. Depending on the size and location of the tumor, the total radiations dose is delivered in 1 session, or in lower doses over the course of 4 to 6 weeks.
Outcomes. Prolactin levels return to normal in ane out of 3 patients treated with radiation therapy.1 However, equally radiation treatment lowers prolactin levels over fourth dimension, information technology may take years to reach this consequence. Your doctor is probable to prescribe medicines while y'all wait to see results.
Side furnishings and complications. The most common side effect is depression levels of thyroid hormone. In up to half of patients, radiation therapy may also lead to a decrease in other pituitary hormones.8 Vision loss and brain injury are rare complications. Rarely, other types of tumors tin can develop many years subsequently in areas that were in the path of the radiation beam.
How exercise doctors treat prolactinomas during pregnancy?
Before pregnancy. Having a prolactinoma may brand information technology difficult for you to become pregnant, but treatment with dopamine agonists is very effective in restoring fertility.
Use of dopamine agonists is unremarkably stopped once a pregnancy is confirmed.
When pregnancy is confirmed. Although studies advise that both bromocriptine and cabergoline tin can be safely taken in the early on stages of pregnancy, bromocriptine is typically preferred considering of its longer safety tape.1 As soon every bit your pregnancy is confirmed, your doctor will usually advise you to end taking these medicines to forbid any possible effects on the fetus.
During pregnancy. Prolactin levels unremarkably increase during pregnancy, preparing your breasts to make milk later on your baby is built-in. The pituitary gland often doubles in size during pregnancy. Your prolactinoma may also grow in size, peculiarly if it is already large. If you brainstorm to have symptoms such as headaches and changes in vision, your doctor may recommend that you commencement taking the medicine again.
After delivery. After delivery, women with small prolactinomas tin can commonly nurse their babies. If your prolactinoma is big, your medico may suggest that you lot consult with an endocrinologist about breastfeeding.
Doctors don't unremarkably mensurate prolactin levels during pregnancy and breastfeeding. Your md will normally brainstorm to practise then once more a couple of months after you end nursing. In some cases, prolactin levels remain normal after delivery and nursing.9
Clinical Trials for Prolactinoma
The NIDDK conducts and supports clinical trials in many diseases and weather condition, including endocrine diseases. The trials look to find new ways to forestall, detect, or treat disease and amend quality of life.
What are clinical trials for prolactinoma?
Clinical trials—and other types of clinical studies—are function of medical enquiry and involve people like you. When yous volunteer to take part in a clinical report, you lot help doctors and researchers larn more well-nigh disease and improve health intendance for people in the future.
Researchers are studying many aspects of prolactinoma, including new treatments for this condition.
Find out if clinical studies are right for yous.
What clinical studies for prolactinoma are looking for participants?
You lot can view a filtered list of clinical studies on prolactinoma that are open and recruiting at www.ClinicalTrials.gov. You can expand or narrow the listing to include clinical studies from industry, universities, and individuals; still, the National Institutes of Health does not review these studies and cannot ensure they are safe. Always talk with your wellness care professional person before you participate in a clinical report.
References
Source: https://www.niddk.nih.gov/health-information/endocrine-diseases/prolactinoma
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