What mesothelioma is
Mesothelioma is a rare, aggressive cancer of the lining of the lungs (pleural), abdomen (peritoneal), or heart (pericardial). It is caused almost exclusively by inhalation or ingestion of microscopic asbestos fibers. Because the disease has a latency period of 20 to 50 years, most people diagnosed today were exposed decades ago — often at industrial job sites, aboard Navy ships, in shipyards, at refineries, or through asbestos-containing consumer products.