Cardiac Tumor

Cardiac tumors, or heart tumors, are abnormal growths that develop in the heart. They can be benign (noncancerous) or malignant (cancerous).

They range in size and shape, and can grow in different parts of our heart. Some are pedunculated, meaning they grow attached to the heart by a stalk. Their dimensions can range from less than 1 centimeter to as large as 15 centimeters. Both the size and the specific location of the tumor within the heart influence the symptoms a person may experience and determine the urgency and type of treatment required.

Statistics:

They are rare and may be either primary or metastatic. Primary heart tumors are extremely uncommon, with autopsy studies showing an incidence between 0.001% and 0.3%. In contrast, metastatic tumors of the heart are more frequently observed, appearing in 2.3% to 18.3% of autopsy cases.

Types of cardiac tumors:

• Tumors that begin in the heart itself are known as primary heart tumors. These are typically benign (noncancerous), but some may be malignant (cancerous).
• When cancer from another part of the body spreads to the heart, the resulting tumors are called metastatic heart tumors, which are always malignant, as they stem from existing cancer elsewhere in the body. Roughly 75% to 95% of all primary heart tumors are benign.
• However, even noncancerous tumors can pose serious health risks if they disrupt normal heart function or increase the chance of stroke.

1. Noncancerous (Benign) Primary Heart Tumors

In adults, common benign primary heart tumors include:

• Myxoma: The most frequent type of benign heart tumor, making up around 50% of all primary cases. It is usually found in the left atrium. It must be surgically removed to prevent complications such as embolism (a blockage inside a blood vessel).
• Papillary fibroelastoma: The second most common benign heart tumor. It can appear at any age but is most often found in individuals over 60. Typically, it grows on the aortic or mitral valves. Even if asymptomatic, surgical removal is often advised to reduce stroke risk.
• Lipoma: Can occur in people of various ages and may be small or large. Often found in the left ventricle, right atrium, or atrial septum (the wall between the heart’s upper chambers).
• Hemangioma: These vascular tumors can be found from infancy through late adulthood (up to age 65). They usually cause no symptoms. They are often discovered incidentally during tests for other health issues. They may appear alongside tumors in the skin or digestive tract.

In infants and children, benign primary heart tumors include:

• Cardiac rhabdomyoma: The most common heart tumor in young children. These tumors grow in clusters and often regress on their own without the need for treatment.
• Teratoma: Generally forms on the pericardium (the protective sac around the heart) or may arise from the base of the heart’s major blood vessels.
• Fibroma: Typically appears as a single tumor in the ventricular muscle. Unlike rhabdomyomas, fibromas usually require surgical removal due to potential heart complications.
• Hamartoma (also called histiocytoid cardiomyopathy or Purkinje cell hamartoma): May affect the heart’s electrical system and cause rhythm disturbances.

2. Cancerous (Malignant) Primary Heart Tumors

Around 5% to 25% of primary cardiac tumors are malignant. The most common type is sarcoma, which includes several subtypes.

Sarcoma subtypes include:

• Angiosarcoma: The most frequent type in adults. These tumors often develop in the right atrium or pericardium.
• Rhabdomyosarcoma: More common in children and infants, though it can affect adults. These tumors usually appear in clusters and can arise in any chamber of the heart.

Other rare malignant primary heart tumors include:

• Malignant fibrous histiocytoma: Frequently occurs in the left atrium and may obstruct the mitral valve, disrupting normal blood flow.
• Lymphoma: While lymphoma typically affects the lymph nodes, spleen, or bone marrow, it can occasionally develop in the heart, especially in individuals with AIDS.

3. Primary Tumors that are Either Benign or Malignant

Some tumors that originate in the heart can be either noncancerous or cancerous:

• Mesothelioma: When found in the pericardium, it’s usually cancerous. However, if it begins in the atrioventricular node (part of the heart's conduction system), it may be benign.
• Paraganglioma: This tumor usually appears near the base of the heart.

4. Metastatic Heart Tumors

Metastatic heart tumors are malignant tumors that spread to the heart from other parts of the body. Cancers most likely to spread to the heart include:

• Melanoma
• Lung cancer
• Breast cancer
• Lymphoma
• Kidney cancer
• Esophageal cancer

These tumors reflect advanced cancer and are more common than primary cardiac tumors.

Location:

They can develop in various areas within or around the heart. Whether they are primary or metastatic, these tumors may be found in the following locations:

• Endocardium – the inner lining of the heart chambers.
• Myocardium – the muscular layer of the heart wall.
• Heart valves – the structures that regulate blood flow through the heart.
• Pericardium – the protective sac that encloses the heart.
• Heart Chambers
• In case of metastatic heart tumors, it can spread from lung cancer, breast cancer, and non-Hodgkin lymphoma.
• Myxomas are more common in the left atrium.

Staging:

At present, there is no universally accepted staging system, e.g. the TNM system, for cardiac tumors, primarily because of a lack of sufficient data and evidence.

Symptoms:

1. Many individuals with a cardiac tumor experience no symptoms at all.
2. Occurring symptoms are usually non-specific and can resemble those of more common heart conditions.
3. The way symptoms present largely depends on the tumor’s location, size, rate of growth, and friability (how easily pieces of the tumor can break off and enter the bloodstream).

→One distinctive sign is a “tumor plop” sound heard through a stethoscope. This occurs if the tumor blocks the mitral valve and sounds similar to mitral valve stenosis. Hearing this sound, especially in patients without risk factors for valve disease, may raise suspicion of a heart tumor.

Usually detected during checkups or diagnostic services.

Common clinical signs and symptoms may include:

• Heart failure symptoms, such as shortness of breath, leg swelling, and difficulty lying flat.
• Weight loss and loss of appetite.
• Fatigue: Decreased cardiac efficiency due to the tumor can lead to overall fatigue and decreased energy levels.
• Swelling in the limbs: fluid retention and poor circulation due to tumor can cause swelling, particularly in the ankles and legs.
• Hemoptysis: occurs when the tumour affects the blood vessels in the lungs.
• Arrhythmias, or irregular heartbeats.
• Chest pain.
• Stroke-like symptoms, including slurred speech, weakness, or vision changes.
• Pericardial effusion, which is fluid, blood, or tumor material accumulating in the sac around the heart.
• Systemic (constitutional) symptoms, such as fever, unexplained weight loss, elevated inflammatory markers, and anemia.

Causes and Risk Factors:

The exact cause of primary heart tumors is often unknown.

In contrast, metastatic heart tumors occur when cancer from another part of the body such as the lungs or skin spreads to the heart.

• Genetic predisposition: certain inherited conditions, e.g. Carney complex, can increase the development of some noncancerous primary tumors.
• Radiation exposure: previous radiation therapy for cancer treatment can lead to secondary heart tumors.
• Chronic inflammation: prolonged inflammation in the heart tissue can lead to the development of abnormal cell growth and tumors.
• Metastasis: cancer from other parts of the body can spread to the heart.
• Damaged immune system

Risk factors

The potential causes of heart tumors vary depending on whether they are primary or secondary.

The exact origin of primary cardiac tumors is still unclear. However, research suggests that genetic predisposition may play a role in some cases. Several factors may increase the likelihood of developing primary heart tumors, including:

• Tuberous sclerosis
• Gorlin syndrome
• Carney complex
• Family history of cardiac tumors
• Mutations in specific genes, such as:
  • MDM2
  • PDGFRA
  • CDKN2A

In addition, certain factors may slightly raise the risk of malignant heart tumors, including:

• Age: Individuals aged 50 and older are more likely to develop heart cancer.
• Sex: Women have a slightly higher risk than men. (for example in myxomas)
• Race: White individuals are at a greater risk compared to those from other racial or ethnic backgrounds.

Prevention

Since the exact cause of primary heart cancer is unknown, there are no specific prevention recommendations. However, adopting healthy lifestyle habits to reduce the overall risk of cancer and heart disease is always beneficial.

Some important guidelines include:

• Avoiding all tobacco products. Limiting alcohol intake.
• Keeping your body mass index (BMI) under 25
• Engaging in daily physical activity
• Following a diet high in fruits and vegetables and low in processed meats
• Regular checkups are important as it can identify potential health issues early, including heart conditions and cancers.

Diagnosis:

1. Cardiac tumors are detected using imaging tests. If a person has cancer elsewhere and suddenly develops heart problems, doctors may suspect the cancer has spread to the heart, prompting imaging studies to check for tumors.
2. Diagnosing primary heart tumors can be challenging because their symptoms often resemble those of other conditions.

The diagnosis of heart tumors involves a combination of clinical assessments, imaging techniques, and sometimes biopsy. Accurate diagnosis of cardiac tumors depends heavily on efficient clinical information.

The different types of diagnosis treatment are as follows:

• Clinical assessment: a person experiencing a range of symptoms, like chest pain, shortness of breath, and abnormal heart rates. This is the first step to recognizing the growth of a heart tumor. We can be assured of the fact by making the patient undergo physical examinations.
• Echocardiography: This is a non-invasive technique that uses sound waves to create images of the heart and detect any abnormal growth of tissues. This helps to visualize the tumors and assess their size and location.
• Chest X-rays: These reveal abnormalities that may be useful for identifying heart tumors.
• Endomyocardial Biopsy: A tissue sample is taken from the heart using a catheter inserted through a vein.
• Surgical biopsy: Biopsy is performed during surgery, if the tumor is located in an area that is difficult to access with a catheter.
• Imaging Studies - Imaging plays a crucial role in identifying, treating, and monitoring cardiac tumors. **Transthoracic echocardiogram (**Useful for detecting tumors in the heart’s lower chambers (ventricles).) Transesophageal echocardiogram (Useful for detecting tumors in the upper chambers (atria).)
• Cardiac MRI - Magnetic resonance imaging provides high resolution images of the heart. This allows for the detailed studying of the subject.
• Contrast-enhanced cardiac CT scan - Ideal for patients with implanted devices who cannot have an MRI. It also allows evaluation of the entire chest area, including the lungs, blood vessels, and coronary arteries. Computed tomography provides the detailed 2D or 3D images of the heart and its surroundings, identifying it location, size and condition.
• PET scan - Occasionally used to determine if cancer from another part of the body has spread to the heart.

Treatment:

• Metastatic heart tumors: Treatment depends on the source of the cancer. It includes both surgery or chemotherapy.

  • Surgery: This is one of the most common, minimally invasive techniques used for the removal of heart tumors. This may include robotic surgery, which is mostly successful.
  • Chemotherapy: This involves the use of drugs that may be used to target and kill cancer cells to retard its growth and prevent it from spreading to other parts.

  Malignant or cancerous tumors are removed with the help of chemotherapy or radiation as it slows down the cancer’s progression.

• Radiation therapy: This technique is used when surgery is not an option. There are risks of cardiac damage.

• Simple tumor removal - For benign tumors like myxomas, simple surgical removal is typically performed. Special care is needed when connecting the patient to the heart-lung machine to prevent tumor fragments from dislodging. Surgeons usually open both atria through the right superior pulmonary vein to avoid damaging the tumor or its base. The tumor and its attachment to the septum are completely removed. Any defects are repaired using patch material. Aside from the usual risks associated with heart-lung bypass, this procedure is relatively straightforward.

• Complex tumor removal - More extensive tumor removal is possible if the tumor is limited to the heart and, if cancerous, has not spread into surrounding tissues. In advanced cases affecting the right side of the heart, the entire right half may be surgically removed. Pulmonary blood flow is maintained using Fontan circulation, a technique familiar from pediatric heart surgery. However, this can lead to chronic right heart failure.

• Ex-situ tumor removal - If the tumor involves the back wall of the left atrium or the large vessels behind the heart, the heart can be temporarily removed from the chest to allow complete tumor excision. By removing the heart, surgeons can rotate it for better visualization of all affected areas. After the tumor is excised, the heart’s structure is reconstructed using prosthetic materials, patches, valves, or biological tissue before being reimplanted. Depending on how much tissue is removed, patients may develop left and/or right heart failure as a secondary issue.

• Artificial heart implantation - If the tumor affects the left side of the heart and there are no metastases, implantation of a total artificial heart (TAH) may be considered as a last resort, especially for younger patients. Major complications following implantation include bleeding, blood clots, infections, and embolisms related to the anticoagulation therapy required.

• Heart transplantation - In some cases, heart transplantation is an option if distant metastases are ruled out. The procedure has been successful in a few patients. However, a significant risk is that the immunosuppressive drugs needed after transplantation could accelerate the growth of undetected microscopic metastases.

Side Effects:

• Side effects may include high blood pressure, bleeding, abnormal heart rhythms, heart failure, and inflammation of the heart muscle (myocarditis).
• Nausea and unexplained fever
• Fatigue: A feeling of tiredness and lack of energy
• Infections: Cancer treatments often weaken a person’s immune system, making them more prone to infections.
• Blood clots: Some treatments can affect blood clotting factors.
• High blood pressure
• Swelling in the limbs
• Weight loss
• Cardiotoxicity: Damage to the heart muscle or its ability to pump blood effectively.

Timing and Detection of Cardiac Side Effects

• Some cardiac side effects occur during treatment, prompting dose adjustments or discontinuation of therapy.
• Others may remain undetected for years or even decades after treatment has ended.
• Longer cancer survival means more patients may develop late-onset cardiovascular complications.

Specific Cardiac Risks with Immunotherapies

• Immune checkpoint inhibitors, a type of immunotherapy, can cause myocarditis (inflammation of the heart muscle) in a small percentage of patients (around 1%).
• Myocarditis caused by these treatments can be severe and fatal in some cases.

Maintenance:

Heart tumor treatment side effects and maintenance strategies vary based on the tumor type, treatment modality and individual patient factors.

• Regular monitoring: Appointments with cardiologists and oncologists on a regular basis. This will detect any potential issues early, allowing for the treatment.
• Exercise: Regular moderate warm ups can improvise cardiovascular health and overall well-being.
• Weight management: The person should maintain a proper diet. A healthy weight can reduce the strain on the heart.
• Stress management: Stress can exacerbate heart conditions. Incorporating stress-reducing techniques like yoga or meditation can be beneficial.
• Proper medication as suggested by the doctor should be taken by the patient regularly. This maintains blood pressure, heart rate, cholesterol, etc.
• Cardiac rehabilitation: Such programmes can support the patients to recover from heart treatment, both mentally and physically.

FAQs:

1. When should I see my healthcare provider if I have a cardiac tumor?

If you have been diagnosed with a cardiac tumor, it’s essential to follow your healthcare provider’s instructions carefully. They will inform you how frequently you need to attend appointments and outline your treatment plan.

2. Can heart tumor go undetected?

Yes, heart tumors can sometimes go undetected, especially if they are small or asymptomatic. Many heart tumors, including benign ones, may not cause noticeable symptoms, particularly in their early stages. They can be discovered incidentally during imaging tests performed for other reasons.

3. Will I need genetic testing?

Your healthcare provider will be the one to suggest genetic testing for you and possibly your family members. This is especially if there is a concern about inherited conditions related to cardiac tumors.

4. Do certain foods fight heart tumors?

Key foods to include are leafy greens, whole grains, berries, fatty fish, avocados, and nuts. These foods are packed with essential nutrients, fibre, and healthy fats that help lower cholesterol, manage blood pressure, and reduce inflammation, all crucial for a healthy heart.

5. How long is the recovery after surgery?

2 to 3 months or several weeks.

6. What happens after surgery to remove a cardiac tumor?

After tumor removal surgery, regular follow-up visits and routine imaging tests are necessary. These help your provider monitor for any tumor recurrence and assess your heart’s function to address any complications promptly.

7. What if my child is diagnosed with a cardiac tumor?

If your child has a cardiac tumor, their healthcare provider will guide you on the next steps. Immediate treatment may be required depending on the tumor type and severity.