Mesothelioma - A Rare Asbestos Disease Mesothelioma is a tumor that develops in the tissues and linings of certain organs. It can start in the lungs (pleural mesothelioma) or in the stomach liner (peritoneal mesothelioma). Asbestos exposure is the primary risk factor for mesothelioma. After exposure, symptoms may be delayed https://vimeo.com/705016972