Mesothelioma Mesothelioma is a form of cancer that develops in the linings of organs. It most often affects the lungs (pleura) but can also affect the abdominal 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/703522247