Mesothelioma Mesothelioma, a form of cancer, develops in the organ linings. It is most commonly found in the lungs (pleura) but can also affect the lining of the abdomen (peritoneum), heart or the testicles. Mesothelioma is caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. Symptoms https://vimeo.com/704943800