Mesothelioma is a rare cancer that develops in the lining of the body’s internal organs. There are several types of mesothelioma. Around 75 percent to 80 percent of mesotheliomas begin in the lining of the lungs and are called pleural mesothelioma. Another 10 percent to 20 percent, called peritoneal mesothelioma, begin in the tissue surrounding the abdominal area. Other types of mesothelioma include pericardial mesothelioma, which begins in the lining of the heart, and testicular mesothelioma, which begins in the lining of the testicles. Pericardial and testicular mesotheliomas are rare.
Men develop mesothelioma more often than women, and the risk for the disease increases with age. According to the American Society of Clinical Oncology, around 3,000 people are diagnosed with mesothelioma each year.
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