Mesothelioma Mesothelioma is a type of cancer that develops in the linings that surround organs. It usually affects the lung (pleura) but can also affect the lining of the abdomen (peritoneum), heart or testicles. Mesothelioma is caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. Signs https://vimeo.com/705039223