Mesothelioma Mesothelioma is a type of cancer, develops in the organ linings. It usually affects the lung (pleura) but can also affect the abdominal lining (peritoneum) as well as the heart or testicles. Exposure to asbestos fibres is the main cause mesothelioma. Typically, symptoms don't appear until decades after exposure. https://vimeo.com/703524646