Mesothelioma Mesothelioma is a type of cancer, develops in the organ linings. It usually affects the lung (pleura) but it can also affect the abdomen's lining (peritoneum) as well as the heart or testicles. Exposure to asbestos fibres is the cause mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/703526488