Mesothelioma Mesothelioma, a form of cancer, is found in the linings covering organs. It usually affects the lungs (pleura) but can also affect the lining of the abdomen (peritoneum) and heart, as well as testicles. Mesothelioma is caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/703543423