Mesothelioma Mesothelioma is a type of cancer, is found in the organ linings. It usually affects the lung (pleura) but can also affect the lining of the abdomen (peritoneum), heart or testicles. Exposure to asbestos fibres is the main cause of mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/704980341