Mesothelioma Mesothelioma, a form of cancer, develops in the linings covering organs. It most often affects the lungs (pleura) but it can also affect the abdomen's lining (peritoneum), heart or testicles. Mesothelioma is caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. Signs and symptoms Mesothelioma https://vimeo.com/704998227