What is Mesothelioma? Malignant mesothelioma (and mesothelioma) is a cancer that forms in the mesothelium, or the membrane of epithelial cells that surround the thoracic cavity, abdominal cavity, heart and testes. Mesothelioma grows over 20 to 40 years. About 3,000 people a year receive a mesothelioma diagnosis. By the time most people realize they have … Continue reading Mesothelioma Cancer