Mesothelioma - A Rare Asbestos Disease Mesothelioma is a tumor that occurs in the tissues and linings of certain organs. It can start in the lung (pleural mesothelioma) or the stomach liner (peritoneal mesothelioma). Exposure to asbestos is the main risk factor for mesothelioma. It could take years before symptoms https://vimeo.com/705049719