Mesothelioma Mesothelioma, a form of cancer, occurs in the linings covering organs. It usually affects the lungs (pleura) but it can also affect the abdomen's lining (peritoneum) and heart, as well as the testicles. Mesothelioma is a result of asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/704908501