Mesothelioma Mesothelioma is a form of cancer, develops in the linings covering organs. It most often affects the lung (pleura) but it can also affect the abdominal lining (peritoneum), heart or testicles. Exposure to asbestos fibres is the cause of mesothelioma. Typically, symptoms don't appear until decades after exposure. Signs https://vimeo.com/704884984