General Information About Pheochromocytoma and Paraganglioma
Key Points for This Section
- Pheochromocytoma and paraganglioma are rare tumors that come from the same type of tissue.
- Pheochromocytoma is a rare tumor that forms in the adrenal medulla (the center of the adrenal gland).
- Paragangliomas form outside the adrenal gland.
- Certain inherited disorders and changes in certain genes increase the risk of pheochromocytoma or paraganglioma.
- Possible signs of pheochromocytoma and paraganglioma include high blood pressure and headache.
- Symptoms of pheochromocytoma and paraganglioma may occur at any time or be brought on by certain events.
- Tests that examine the blood and urine are used to detect (find) and diagnose pheochromocytoma and paraganglioma.
- Genetic counseling is part of the treatment plan for patients with pheochromocytoma or paraganglioma.
- Certain factors affect prognosis (chance of recovery) and treatment options.
Paragangliomas form in nerve tissue in the adrenal glands and near certain blood vessels and nerves. Paragangliomas that form in the adrenal glands are called pheochromocytomas. Paragangliomas that form outside the adrenal glands are called extra-adrenal paragangliomas. In this summary, extra-adrenal paragangliomas are called paragangliomas.
Pheochromocytoma forms in the adrenal glands. There are two adrenal glands, one on top of each kidney in the back of the upper abdomen. Each adrenal gland has two parts. The outer layer of the adrenal gland is the adrenal cortex. The center of the adrenal gland is the adrenal medulla.
Pheochromocytoma is a rare tumor of the adrenal medulla. Usually, pheochromocytoma affects one adrenal gland, but it may affect both adrenal glands. Sometimes there is more than one tumor in one adrenal gland.
The adrenal glands make important hormones called catecholamines. Adrenaline (epinephrine) and noradrenaline (norepinephrine) are two types of catecholamines that help control heart rate, blood pressure, blood sugar, and the way the body reacts to stress. Sometimes a pheochromocytoma will release extra adrenaline and noradrenaline into the blood and cause symptoms of disease.
Paragangliomas are rare tumors that form near the carotid artery, along nerve pathways in the head and neck, and in other parts of the body. Some paragangliomas make extra catecholamines called adrenaline and noradrenaline. The release of these extra catecholamines into the blood may cause symptoms of disease.
Anything that increases your chance of getting a disease is called a risk factor. Having a risk factor doesn't mean that you will get cancer; not having risk factors doesn’t mean that you will not get cancer. Talk to your doctor if you think you may be at risk.
- Multiple endocrine neoplasia 2 syndrome, types A and B (MEN2A and MEN2B).
- von Hippel-Lindau (VHL) syndrome.
- Neurofibromatosis type 1 (NF1).
- Hereditary paraganglioma syndrome.
- Carney-Stratakis dyad (paraganglioma and gastrointestinal stromal tumor [GIST]).
- Carney triad (paraganglioma, GIST, and pulmonary chondroma).
Some tumors do not make extra adrenaline or noradrenaline and do not cause symptoms. These tumors are sometimes found when a lump forms in the neck or when a test or procedure is done for another reason. Symptoms of pheochromocytoma and paraganglioma occur when too much adrenaline or noradrenaline is released into the blood. These and other symptoms may be caused by pheochromocytoma and paraganglioma. Other conditions may cause the same symptoms. Check with your doctor if you have any of the following problems:
- High blood pressure.
- Heavy sweating for no known reason.
- A strong, fast, or irregular heartbeat.
- Being shaky.
- Being extremely pale.
The most common symptom is high blood pressure. It may be hard to control. Very high blood pressure can cause serious health problems such as irregular heartbeat, heart attack, stroke, or death.
Symptoms of pheochromocytoma and paraganglioma may occur when one of the following events happens:
- Hard physical activity.
- A physical injury or having a lot of emotional stress.
- Going under anesthesia.
- Surgery, including procedures to remove the tumor.
- Eating foods high in tyramine (such as red wine, chocolate, and cheese).
The following tests and procedures may be used:
- Physical exam and history : An exam of the body to check general signs of health, including checking for signs of disease, such as high blood pressure or anything else that seems unusual. A history of the patient’s health habits and past illnesses and treatments will also be taken.
- Twenty-four-hour urine test: A test in which urine is collected for 24 hours to measure the amounts of catecholamines in the urine. Substances caused by the breakdown of these catecholamines are also measured. An unusual (higher or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it. Higher-than-normal amounts of certain catecholamines may be a sign of pheochromocytoma.
- Blood catecholamine studies: A procedure in which a blood sample is checked to measure the amount of certain catecholamines released into the blood. Substances caused by the breakdown of these catecholamines are also measured. An unusual (higher than or lower than normal) amount of a substance can be a sign of disease in the organ or tissue that makes it. Higher-than-normal amounts of certain catecholamines may be a sign of pheochromocytoma.
- CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the neck, chest, abdomen, and pelvis, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
- MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body such as the neck, chest, abdomen, and pelvis. This procedure is also called nuclear magnetic resonance imaging (NMRI).
Genetic testing may be recommended by a genetic counselor for patients who:
- Have a personal or family history of traits linked with inherited pheochromocytoma or paraganglioma syndrome.
- Have tumors in both adrenal glands.
- Have more than one tumor in one adrenal gland.
- Have symptoms of extra catecholamines being released into the blood or malignant (cancerous) paraganglioma.
- Are diagnosed before age 40.
Genetic testing is sometimes recommended for patients with pheochromocytoma who:
- Are aged 40 to 50 years.
- Have a tumor in one adrenal gland.
- Do not have a personal or family history of an inherited syndrome.
When certain gene changes are found during genetic testing, the testing is usually offered to family members who are at risk but do not have symptoms.
Genetic testing is not recommended for patients older than 50 years.
- Whether the tumor is benign or malignant.
- Whether the tumor is in one area only or has spread to other places in the body.
- Whether there are symptoms caused by a higher-than-normal amount of catecholamines.
- Whether the tumor has just been diagnosed or has recurred (come back).