Mesothelioma Mesothelioma, a form of cancer, occurs in the linings covering organs. It usually affects the lungs (pleura) but it can also affect the abdominal lining (peritoneum) as well as the heart or testicles. Mesothelioma can be caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/704973792