Overview

Malignant mesothelioma (me-zoe-thee-lee-O-muh) is a type of cancer that occurs in the thin layer of tissue that covers the majority of your internal organs (mesothelium).

Mesothelioma is an aggressive and deadly form of cancer. Mesothelioma treatments are available, but for many people with mesothelioma, a cure is not possible.

Doctors divide mesothelioma into different types based on what part of the mesothelium is affected. Mesothelioma most often affects the tissue that surrounds the lungs (pleura). This type is called pleural mesothelioma. Other, rarer types of mesothelioma affect tissue in the abdomen (peritoneal mesothelioma), around the heart and around the testicles.

Mesothelioma doesn't include a form of noncancerous (benign) tumor that occurs in the chest and is sometimes called benign mesothelioma or solitary fibrous tumor.

Source: http://www.mayoclinic.com

Symptoms

Signs and symptoms of mesothelioma vary depending on where the cancer occurs.

Pleural mesothelioma, which affects the tissue that surrounds the lungs, causes signs and symptoms that may include:

• Chest pain under the rib cage
• Painful coughing
• Shortness of breath
• Unusual lumps of tissue under the skin on your chest
• Unexplained weight loss

Peritoneal mesothelioma, which occurs in tissue in the abdomen, causes signs and symptoms that may include:

• Abdominal pain
• Abdominal swelling
• Lumps of tissue in the abdomen
• Unexplained weight loss

Other forms of mesothelioma

Signs and symptoms of other types of mesothelioma are unclear, since these forms of the disease are very rare.

Pericardial mesothelioma, which affects tissue that surrounds the heart, can cause signs and symptoms such as breathing difficulty and chest pains.

Mesothelioma of tunica vaginalis, which affects tissue surrounding the testicles, may be first detected as swelling or a mass on a testicle.

When to see a doctor

See your doctor if you have signs and symptoms that may indicate mesothelioma. Signs and symptoms of mesothelioma aren't specific to this disease and, due to the rarity of mesothelioma, are more likely to be related to other conditions. If any persistent signs and symptoms seem unusual or bothersome, ask your doctor to evaluate them. Tell your doctor if you've been exposed to asbestos.

Source: http://www.mayoclinic.com

Causes

In general, cancer begins when a series of genetic mutations occur within a cell, causing the cell to grow and multiply out of control. It isn't clear what causes the initial genetic mutations that lead to mesothelioma, though researchers have identified factors that may increase the risk. It's likely that cancers form because of an interaction between many factors, such as inherited conditions, your environment, your health conditions and your lifestyle choices.

Source: http://www.mayoclinic.com

Diagnosis

If you have signs and symptoms that might indicate mesothelioma, your doctor will conduct a physical exam to check for any lumps or other unusual signs.

Your doctor may order imaging scans, such as a chest X-ray and a computerized tomography (CT) scan of your chest or abdomen, to look for abnormalities.

Based on the findings, you may undergo further testing to determine whether mesothelioma or another disease is causing your signs and symptoms.

Biopsy

Biopsy, a procedure to remove a small portion of tissue for laboratory examination, is the only way to determine whether you have mesothelioma. Depending on what area of your body is affected, your doctor selects the right biopsy procedure for you.

Options include:

• Fine-needle aspiration. The doctor removes fluid or a piece of tissue with a small needle inserted into your chest or abdomen.
• Thoracoscopy. Thoracoscopy allows the surgeon to see inside your chest. In this procedure, the surgeon makes one or more small incisions between your ribs. A tube with a tiny video camera is then inserted into your chest cavity — a procedure sometimes called video-assisted thoracoscopic surgery (VATS). Special surgical tools allow your surgeon to cut away small pieces of tissue for testing.
• Laparoscopy. Laparoscopy allows the surgeon to see inside your abdomen. Using one or more small incisions into your abdomen, the surgeon inserts a tiny camera and special surgical tools to obtain a small piece of tissue for examination.
• Thoracotomy. Thoracotomy is surgery to open your chest between the ribs to allow a surgeon to check for signs of disease. A sample of tissue may be removed for testing.
• Laparotomy. Laparotomy is surgery to open your abdomen to allow a surgeon to check for signs of disease. A sample of tissue may be removed for testing.

The tissue sample is analyzed under a microscope to see whether the abnormal tissue is mesothelioma and what types of cells are involved. The type of mesothelioma you have determines your treatment plan.

Determining the extent of the cancer

Once your mesothelioma is confirmed, your doctor may recommend additional tests to understand whether your cancer has spread to your lymph nodes or to other areas of your body.

Tests may include:

• CT scans of the chest and abdomen
• Magnetic resonance imaging (MRI)
• Positron emission tomography (PET)

Your doctor determines which tests are appropriate for you. Not every person needs every test.

Your doctor uses the information from these tests to assign your cancer a stage. The stages of pleural mesothelioma are indicated using Roman numerals ranging from I to IV. A lower numeral means the cancer is more likely to be localized to the area around the lungs and the highest numeral means the cancer has spread to other areas of the body.

The cancer staging system continues to evolve and is becoming more complex as doctors improve cancer diagnosis and treatment. Your doctor uses your cancer stage to select the treatments that are right for you.

Formal stages aren't available for other types of mesothelioma because these types are rare and aren't well-studied.

Source: http://www.mayoclinic.com

Complications

As pleural mesothelioma spreads in the chest, it puts pressure on the structures in that area. This can cause complications, such as:

• Difficulty breathing
• Chest pain
• Difficulty swallowing
• Pain caused by pressure on the nerves and spinal cord
• Accumulation of fluid in the chest (pleural effusion), which can compress the lung nearby and make breathing difficult

Source: http://www.mayoclinic.com

Prevention

Reducing your exposure to asbestos may lower your risk of mesothelioma.

Find out whether you work with asbestos

Most people with mesothelioma were exposed to the asbestos fibers at work. Workers who may encounter asbestos fibers include:

• Miners
• Factory workers
• Insulation manufacturers
• Ship builders
• Construction workers
• Auto mechanics

Ask your employer whether you have a risk of asbestos exposure on the job.

Follow your employer's safety regulations

Follow all safety precautions in your workplace, such as wearing protective equipment. You may also be required to shower and change out of your work clothes before taking a lunch break or going home. Talk to your doctor about other precautions you can take to protect yourself from asbestos exposure.

Be safe around asbestos in your home

Older homes and buildings may contain asbestos. In many cases, it's more dangerous to remove the asbestos than it is to leave it intact. Breaking up asbestos may cause fibers to become airborne, where they can be inhaled. Consult experts trained to detect asbestos in your home. These experts may test the air in your home to determine whether the asbestos is a risk to your health. Don't attempt to remove asbestos from your home — hire a qualified expert. The Environmental Protection Agency offers advice on its website for dealing with asbestos in the home.

Alternative medicine

No alternative medicine treatments have proved helpful in treating mesothelioma. But complementary and alternative treatments may help control mesothelioma signs and symptoms. Discuss options with your doctor.

Mesothelioma can cause pressure within your chest that can make you feel as if you're always short of breath. Breathlessness can be distressing. Your doctor may recommend using supplemental oxygen or taking medications to make you more comfortable, but often these aren't enough. Combining your doctor's recommended treatments with complementary and alternative approaches may help you feel better.

Alternative treatments that have shown some promise in helping people cope with breathlessness include:

• Acupuncture. Acupuncture uses thin needles inserted at precise points into your skin.
• Breath training. A nurse or physical therapist can teach you breathing techniques to use when you feel breathless. Sometimes you may feel breathless and begin to panic. Using these techniques may help you feel more in control of your breathing.
• Relaxation exercises. Slowly tensing and relaxing different muscle groups may help you feel more at ease and breathe easier. Your doctor may refer you to a therapist who can teach you relaxation exercises so that you can do them on your own.
• Sitting near a fan. Directing a fan to your face may help ease the sensation of breathlessness.

Source: http://www.mayoclinic.com

Coping and support

A diagnosis of mesothelioma can be devastating not only to you but also to your family and friends. In order to regain a sense of control, try to:

• Learn enough about mesothelioma to make decisions about your care. Write down questions to ask your doctor. Ask your health care team for information to help you better understand your disease. Good places to start looking for more information include the National Cancer Institute and the American Cancer Society.
• Surround yourself with a support network. Close friends or family can help you with everyday tasks, such as getting you to appointments or treatment. If you have trouble asking for help, learn to be honest with yourself and accept help when you need it.
• Seek out other people with cancer. Ask your health care team about cancer support groups in your community. Sometimes there are questions that can only be answered by other people with cancer. Support groups offer a chance to ask these questions and receive support from people who understand your situation. Online support message boards, such as the American Cancer Society's Cancer Survivors Network, can offer similar benefits while allowing you to remain anonymous.
• Plan ahead. Ask your health care team about advance directives that give your family guidance on your medical wishes in case you can no longer speak for yourself.

Source: http://www.mayoclinic.com

Risk factors

Asbestos exposure: The primary risk factor for mesothelioma

Asbestos is a mineral that's found naturally in the environment. Asbestos fibers are strong and resistant to heat, making them useful in a wide variety of applications, such as in insulation, brakes, shingles, flooring and many other products.

When asbestos is broken up, such as during the mining process or when removing asbestos insulation, dust may be created. If the dust is inhaled or swallowed, the asbestos fibers will settle in the lungs or in the stomach, where they can cause irritation that may lead to mesothelioma. Exactly how this happens isn't understood. It can take 20 to 40 years or more for mesothelioma to develop after asbestos exposure.

Most people with years of asbestos exposure never develop mesothelioma. And yet, others with very brief exposure develop the disease. This indicates that other factors may be involved in determining whether someone gets mesothelioma or doesn't. For instance, you could inherit a predisposition to cancer or some other condition could increase your risk.

Risk factors

Factors that may increase the risk of mesothelioma include:

• Personal history of asbestos exposure. If you've been directly exposed to asbestos fibers at work or at home, your risk of mesothelioma is greatly increased.
• Living with someone who works with asbestos. People who are exposed to asbestos may carry the fibers home on their skin and clothing. Exposure to these stray fibers over many years can put others in the home at risk of mesothelioma. People who work with high levels of asbestos can reduce the risk of bringing home asbestos fibers by showering and changing clothes before leaving work.
• A family history of mesothelioma. If your parent, sibling or child has mesothelioma, you may have an increased risk of this disease.

Source: http://www.mayoclinic.com