Mesothelioma Mesothelioma is a type of cancer, develops in the linings of organs. It most often affects the lung (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/703531726