Mesothelioma Mesothelioma is a form of cancer, is found in the organ linings. It most often affects the lungs (pleura) but it can also affect the abdomen's lining (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/704929624