Mesothelioma Overview

Mesothelioma Causes & Steps After a Diagnosis
Mesothelioma is a rare type of cancer that develops in the mesothelial cells that lines many organs and body cavities. The mesothelium (composed of mesothelial cells) is the membrane that lines three of the body's cavities, and depending on what cavity it lines it is given a specific name: the thoracic cavity (pleura), abdominal cavity (peritoneum), and the heart sac (pericardium).

Mesothelioma is a rare cancer that can develop in the mesothelium of the thoracic cavity in the lungs.The mesothelium that covers the internal organs is called the visceral mesothelium, while the layer that covers the body wall is called parietal mesothelium.
Mesothelium tissue also surrounds the male internal reproductive organs and covers the internal reproductive organs in women.
Mesothelioma is an aggressive cancer of the mesothelium, in which cells of the mesothelium become abnormal and divide uncontrollably and without order. They can invade and damage nearby tissues and organs. Most cases of mesothelioma begin in the thoracic cavity (pleura) or the abdominal cavity (peritoneum).
Approximately 2,000 to 3,000 cases of mesothelioma are diagnosed each year in the United States, comprising around 3 percent of all cancer diagnoses. This cancer occurs about four times more frequently in men than in women. All forms of mesothelioma, except for benign mesothelioma, are invariably fatal. The prognosis for mesothelioma is almost always poor and most studies report a median survival of less than one year, but the prognosis really depends on how early the cancer is diagnosed and how aggressively it is treated.
After a mesothelioma patient learns of their diagnosis, the next step is often exploring applicable treatment options to create the best treatment plan possible. Treatment options range from surgery to chemotherapy and we offer information about the various types of treatment available to patients. To help you learn more about these options, we provide an informational packet to interested patients and their loved ones at the top, right of this page.
Causes of Mesothelioma
Mesothelioma is caused by asbestos exposure. Asbestos is a naturally-occurring fibrous substance that was widely used in the twentieth century in a number of different industries. Popular because of its durability, fire resistance, and insulating properties, it was regularly used in the manufacture of several thousand different products, up until the time that asbestos warnings were issued in the mid-1970s. It is estimated that approximately 80 to 90 percent of mesothelioma cases are caused by asbestos exposure.
The exact way in which asbestos causes mesothelioma is not well understood though doctors and researchers have put forth many hypotheses. What is apparent, however, is that any length of exposure to asbestos can be hazardous and may result in the development of asbestos-related diseases later in life.
Types of Mesothelioma
There are five known types of mesothelioma. Four of these are malignant cancers, and one is a benign condition.

Once asbestos is inhaled it can effect many of the bodys different organs including the throat, lungs, stomach, heart and testicles.Pleural Mesothelioma: This type of mesothelioma develops in the lining of the lungs, known as the pleura. It is the most common form of malignant mesothelioma, with around 70 percent of cases being pleural in origin.
Peritoneal Mesothelioma: This form of mesothelioma develops in the lining of the abdominal cavity, known as the peritoneal membrane. Approximately 25 percent of mesothelioma cases are of this type.
Pericardial Mesothelioma: This form of mesothelioma develops in the lining of the heart, known as the pericardium. About 5 percent of all mesothelioma cases are pericardial.
Testicular Mesothelioma: This is the rarest type of malignant mesothelioma; to date, there have been less than 100 recorded cases. Testicular mesothelioma develops in the tunica vaginalis of the testicles.
Benign Mesothelioma: The benign form of mesothelioma most commonly develops in the pleura. This is the only form of mesothelioma for which full cure and recovery is a probable outcome, though it may be a precursor of future asbestos-related problems.