Mesothelioma Mesothelioma is a type of cancer, occurs in the linings covering organs. It most often affects the lungs (pleura) but it can also affect the abdomen's lining (peritoneum), heart or the testicles. Exposure to asbestos fibres can be the cause mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/703529656