Mesothelioma Mesothelioma is a form of cancer that grows in the linings that cover organs. It most often affects the lung (pleura) but can also affect the abdomen's lining (peritoneum), heart or testicles. Exposure to asbestos fibres can be the cause mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/704984551