Mesothelioma Mesothelioma is a kind of cancer that forms in the linings that surround organs. It is most commonly found in the lung (pleura) but can also affect the abdominal lining (peritoneum), heart or testicles. Mesothelioma is caused by asbestos fibre exposure. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/705039223