Mesothelioma Mesothelioma is a type of cancer that forms in the linings that cover organs. It most often affects the lung (pleura) but it can also affect the abdomen's lining (peritoneum), heart or testicles. Exposure to asbestos fibres is the cause mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/704987711