Here are the answers to your questions about this rare tumor called Paraganglioma!

Do you sometimes suddenly feel like you're sweating profusely, your heart is beating fast, your head is pounding? Or do you feel like your blood pressure is suddenly going up for no reason? Even though you might think these are just random things, sometimes there could be another reason behind this. Paraganglioma is one such rare but important condition to be aware of.

So, what is this paraganglioma?

Simply put, paragangliomas are rare tumors that form in your body. They often develop near the carotid artery, a major blood vessel in your neck, along the nerves in your head and neck, or elsewhere in your body. These tumors are made up of a special type of cell called chromaffin cells . These cells produce hormones called catecholamines and release them into your bloodstream.

Did you know that the adrenal glands, located above our kidneys, produce several types of hormones? These catecholamines are hormones that control several very important functions in our body. Do you know what they are?

• Your heart rate.
• Blood pressure.
• Blood sugar level (`blood glucose`).
• How our body responds to stress.

The main types of catecholamines that are important are:

• Dopamine.
• Epinephrine (this is what we also call adrenaline).
• Norepinephrine (also called noradrenaline).

Although paragangliomas do not develop in the adrenal glands, these tumors are formed from the tissue that is in the adrenal glands. Therefore, in addition to these paragangliomas, catecholamine hormones can also accumulate in the blood. That's when various symptoms begin to appear.

What is the difference between Paraganglioma and Pheochromocytoma?

These two names can be a bit confusing, right? Paraganglioma and pheochromocytoma are both rare tumors that arise from the aforementioned chromaffin cells. The main difference between the two is where they form in the body.

Pheochromocytomas develop in the middle part of your adrenal gland, called the adrenal medulla. Paragangliomas develop outside the adrenal gland. They are often found along arteries or nerves in the neck. That's why paragangliomas are sometimes called 'extra-adrenal pheochromocytomas'.

Is Paraganglioma a cancer?

This is a problem that many people have. These tumors, called paragangliomas , can be cancerous (malignant) or non-cancerous (benign). Roughly speaking, about 20% of paragangliomas are cancerous.

But the challenge here is that sometimes it's hard for doctors to tell for sure whether a tumor is cancerous or not. That is, even if the tumor is surgically removed and its tissue is examined under a microscope, sometimes it's not possible to say for sure. Therefore, a paraganglioma is usually considered cancerous in the following cases:

• If the tumor has spread to surrounding tissues (this is called `regional spread of paraganglioma`).
• If it has spread to distant organs, such as your lungs or bones (this is called `metastasized`).
• If it has come back after being initially treated and cured (this is called `recurred`).

If it is cancer, how does it spread?

If this paraganglioma is a cancer, there is no standard staging system for it. Instead, it is described as follows:

• Localized paraganglioma: The tumor is located in only one place.
• Regional paraganglioma: The cancer has spread to lymph nodes or other tissues near where it first started.
• Metastatic paraganglioma: The cancer has spread to other parts of your body, such as your liver, lungs, bones, or distant lymph nodes. Between 35% and 50% of cancerous paragangliomas can spread (metastasize) this way.
• Recurrent paraganglioma: The cancer has come back after being treated and cured. It can be in the same place it was before, or it can be in a different part of the body.

How fast do these nuts grow?

Usually, paragangliomas grow very slowly. However, this can vary from person to person. Some people may grow a little faster.

Who is affected the most by this situation?

This condition, called paraganglioma , can develop at any age. However, it is most common in people between the ages of 30 and 50. Also, approximately 10% of cases are reported in children.

How common is Paraganglioma?

This is actually a very rare tumor. Statistically, it's estimated that only about two people in a million develop paragangliomas. So you can imagine how rare this is.

What are the symptoms of Paraganglioma?

The symptoms of paragangliomas are caused by the tumor releasing too much of the aforementioned adrenaline or noradrenaline into your bloodstream. However, some paragangliomas do not produce this extra hormone, and therefore do not cause any symptoms (they are called asymptomatic).

The most commonly seen symptoms are:

• Sudden onset of high blood pressure (hypertension).
• Headache.
• Excessive sweating for no reason.
• A rapid, irregular heartbeat that is so loud that the heart can be heard beating.
• Feeling like your body is shaking.

In addition to these, there are also symptoms that are less common :

• Being much paler than you usually look.
• Nausea and/or vomiting.
• Diarrhea.
• Constipation.
• High blood sugar levels (hyperglycemia).
• A sudden drop in blood pressure that causes dizziness when you stand up (this is called orthostatic hypotension).
• Being thin for no reason.

Some people may experience these symptoms infrequently, or in bursts. Imagine, sometimes there is nothing wrong, then these symptoms suddenly appear, and then they disappear after a while. This is why it is sometimes late to recognize this.

What causes Paraganglioma?

Most of the time, there is no specific cause for paragangliomas. That is, they occur randomly. However, approximately 25% to 35% of people develop paragangliomas as a result of a genetic condition that runs in families (hereditary condition). Some of these conditions include:

• Multiple endocrine neoplasia 2 syndrome, types A and B (MEN2A and MEN2B)).
• Von Hippel-Lindau (VHL) disease.
• Neurofibromatosis type 1 (NF1).
• Hereditary paraganglioma syndrome.
• Carney-Stratakis dyad (in which paraganglioma may be accompanied by gastrointestinal stromal tumor (GIST)).
• Carney triad (which may include paraganglioma, GIST, and a type of lung tumor called pulmonary chondroma).

How is Paraganglioma diagnosed?

Paraganglioma can be difficult to diagnose because it is a rare tumor and sometimes causes no symptoms. Sometimes, doctors find paragangliomas while doing tests for another reason.

A doctor may suspect paraganglioma after considering the following factors:

• Your complete medical history, especially whether anyone in your family has ever had pheochromocytoma or paraganglioma.
• A complete physical and medical examination.
• The nature of some symptoms. For example, if you have high blood pressure that is not controlled by normal treatments.

What tests are done for this?

Your doctor may use these tests and procedures to determine if you have paraganglioma:

• Physical exam: Your doctor will examine you and check your general health, such as your blood pressure. He or she will also ask about your and your family's medical history, especially any hormone-related problems.
• 24-hour urine test: This involves collecting a sample of your urine over a 24-hour period and measuring the amount of adrenal hormones called catecholamines. It also looks for substances that are formed when these hormones break down. If these catecholamines are present in your urine at higher than normal levels, it could be a sign of a paraganglioma.
• Blood catecholamine tests: These tests measure the levels of catecholamines in your blood. As mentioned earlier, they also look for substances that are produced when these hormones break down. If these are present in higher than normal amounts in the blood, it can also be a sign of paraganglioma.
• PET scan (positron emission tomography scan): A PET scan involves injecting a safe radioactive chemical (radiotracer) into your body and taking pictures of your organs and tissues using a device called a PET scanner. This scan identifies highly active cells and tumors that absorb the chemical. This can help determine if there is a health problem. This scan is especially good for pinpointing the location of a paraganglioma.
• CT scan (computer tomography scan): A CT scan is a procedure that takes a series of X-rays from different angles to create detailed pictures of the inside of your body. Your doctor may recommend a CT scan to help pinpoint the location of a tumor (usually in the neck).
• MRI scan (magnetic resonance imaging): An MRI uses a magnet, radio waves, and a computer to make a series of detailed pictures of the inside of your body. Your doctor may recommend an MRI to get a better look at the area where the tumor is located.

After your doctor diagnoses you with paraganglioma, they may do further tests to see if it has spread to other parts of your body.

Is Genetic Testing Necessary?

If you are diagnosed with paraganglioma, your doctor will likely recommend that you undergo genetic counseling to find out if you have an inherited syndrome and are at risk for developing other cancers associated with it.

Your doctor may recommend genetic testing in these cases:

• If you or someone in your family has symptoms related to hereditary pheochromocytoma or paraganglioma syndrome.
• If you have signs of higher than normal levels of catecholamines in your blood or signs of a cancerous paraganglioma.
• If you have developed paraganglioma before the age of 40.

If your genetic counselor finds any gene changes in your test results, he or she will likely recommend that other members of your family (even those who are asymptomatic but at risk) also get tested.

How is Paraganglioma treated?

The treatment of paraganglioma depends on several factors, including:

• The size of the tumor.
• Whether the tumor is cancerous (malignant) or benign (benign).
• Whether you have symptoms due to elevated levels of catecholamines.
• Is the tumor only in one place, or has it spread (metastasized) to other parts of the body?
• Whether the tumor was detected for the first time, or whether it had previously been cured and then recurred.

If you have a paraganglioma that causes symptoms due to excess hormones, your doctor will prescribe medications to control those symptoms. These medications may include:

• Medicines that control your blood pressure, for example alpha-blockers .
• Medications to keep your heart rate normal, for example beta-blockers .
• Medications that block the effects of hormones released in excess by your adrenal gland(s).

Treatment options for paraganglioma are:

• Surgical removal of the tumor.
• Radiation therapy.
• Chemotherapy.
• Ablation therapy.
• Targeted therapy.

Together, you and your medical team will determine the treatment plan that best suits you and your condition.

Surgical removal of the tumor

The main treatment for paraganglioma is surgery. During the surgery to remove the tumor, your surgeon will check the surrounding tissue and lymph nodes to see if the tumor has spread. If it has, the surgeon will remove the affected tissue, if possible.

Most paragangliomas can be removed using minimally invasive techniques, such as laparoscopic surgery . This involves making a few small incisions in your skin and removing the tumor with special instruments. However, larger tumors may require traditional open surgery.

After surgery, your doctor will check the levels of catecholamines in your blood or urine. If the levels of catecholamines return to normal, this is a sign that all of the paraganglioma cells have been removed.

Radiation Therapy

Radiation therapy is a cancer treatment that uses high-energy beams of radiation to kill cancer cells or stop them from growing. This is done while minimizing damage to surrounding healthy tissue.

There are two types of radiation therapy:

• External radiation therapy: This involves using a machine outside your body to direct radiation to the area where the cancer is located.
• Internal radiation therapy: This involves placing a radioactive substance in needles, seeds, wires, or catheters, which are then placed directly into or near the tumor by a doctor.

The type of radiation therapy your doctor recommends depends on whether your cancer is localized, regional, distant, or has come back. Doctors most often use external beam radiation therapy and/or 131I-MIBG therapy to treat cancerous paragangliomas. 131I-MIBG therapy is a method of administering a radioactive substance to certain types of cancer cells, which is then injected into the body and the radiation it emits kills the cells.

Chemotherapy

The standard treatment for metastatic paraganglioma is chemotherapy. This involves using drugs to kill cancer cells, stop them from dividing, or stop them from growing. Chemotherapy is usually given intravenously. Although this is usually an effective treatment, it can cause side effects.

Ablation Therapy

Ablation therapy is a minimally invasive treatment option that uses very high or very low temperatures to destroy tumors. Ablation therapies that help kill cancer cells and abnormal cells include:

• Radiofrequency ablation: This involves using radio waves to heat and destroy cancer cells and abnormal cells. The radio waves are sent through electrodes (small devices that conduct electricity).
• Cryoablation: This treatment uses liquid nitrogen or liquid carbon dioxide to freeze and destroy cancer cells and abnormal cells.

Targeted Therapy

Targeted therapy is a treatment option that uses drugs or other substances to attack only specific cancer cells, without harming healthy cells. Doctors use targeted therapy to treat distant and recurrent paragangliomas.

Researchers are currently studying the potential of a drug called sunitinib , a tyrosine kinase inhibitor , to treat distant paragangliomas. Tyrosine kinase inhibitor therapy is a type of targeted therapy that stops tumors from growing.

Can the development of paraganglioma be prevented?

Unfortunately, paragangliomas cannot be prevented. However, if you have certain inherited syndromes and genes that put you at risk for developing paragangliomas, genetic counseling can help you get tested for paragangliomas and possibly catch them early.

Talk to your doctor if your first-degree relatives (siblings and parents) have had paraganglioma or pheochromocytoma, and/or if you have any of these genetic conditions:

• Multiple endocrine neoplasia 2 syndrome.
• Von Hippel-Lindau (VHL) disease.
• Neurofibromatosis type 1.
• Hereditary paraganglioma syndrome.
• Carney-Stratakis dyad.
• Carney triad.

What is the prognosis in this situation?

The outlook for paragangliomas, that is, the chance of recovery and survival, varies depending on several factors. Among them:

• Where the tumor is in your body and how big it is.
• Whether it is cancer or has spread to other parts of the body.
• Was the tumor surgically removed, and if so, how much of the tumor was removed during surgery?

People with a small paraganglioma that has not spread to other parts of the body (has not metastasized) have a five-year survival rate of about 95%. However, people with a paraganglioma that has recurred after initial treatment or has spread to other parts of the body (metastasized) have a five-year survival rate of between 34% and 60% .

Also, there are some severe paragangliomas that, even if they have not spread far, cannot be completely removed by surgery because they have spread far enough into the surrounding tissue. In such cases, the excessive secretion of adrenaline and noradrenaline can be dangerous and difficult to treat.

Most importantly, paragangliomas, whether they are cancerous or not, if left untreated, can cause serious, even life-threatening complications due to the excessive amounts of adrenaline and noradrenaline they secrete.

Some of these complications are:

• Heart muscle disease (cardiomyopathy).
• Inflammation of your heart muscle (`myocarditis`).
• Uncontrolled bleeding in your brain (cerebral hemorrhaging).
• Fluid buildup in your lungs (pulmonary edema).
• Heart attack (`myocardial infarction`).
• Stroke.
• Coma.
• Death.

When should I see a doctor?

If you are diagnosed with paraganglioma and you experience suspicious symptoms, see your doctor immediately.

If you experience symptoms of paraganglioma, such as high blood pressure and headaches, talk to your doctor. Since paraganglioma is rare, it's still important to treat high blood pressure, even if it's unlikely you have it.

If you find out that one of your first-degree relatives (siblings, parents) has a genetic syndrome such as ``Multiple endocrine neoplasia 2 syndrome`` or ``Von Hippel-Lindau (VHL) disease``, ask your doctor about genetic testing, as this may increase your risk of developing paraganglioma.

What questions should you ask your doctor?

If you are diagnosed with paraganglioma, it may be helpful to ask your doctor these questions:

• Why did I develop paraganglioma?
• Can my children and/or relatives develop paraganglioma?
• What treatment options do I have?
• What are the side effects of different treatments?
• How can I manage my symptoms?

Finally, things to remember (Take-Home Message)

Paraganglioma is a rare condition, but it's important to be aware of it. If you have persistent symptoms that are difficult to understand, especially sudden high blood pressure, sweating, or a fast heart rate, it's wise to seek medical advice rather than dismissing them as just a fluke.

Although the cause of paraganglioma is often unknown, it is linked to certain hereditary conditions. So if someone in your family has had paraganglioma or pheochromocytoma, genetic testing can help you find out your risk, as well as whether you may develop other health problems. If you have any questions about this, don't hesitate to talk to your doctor. They are here to help you.

` Paraganglioma, Paraganglioma, Pheochromocytoma, Chromaffin cells, Catecholamines, Hormones, Tumors, Cancer, Symptoms, High Blood Pressure, Genetic Diseases