Pleural Mesothelioma and Non asbestos lawsuit Mesothelioma The majority of mesothelioma in the pleural region is caused by Asbestos Law exposure according to research. However certain patients do not have known risk factors. Mesothelioma is a cancer of the lining of the lungs (pleura), asbestos lawsuit tummy (peritoneal mesothelioma) and the heart. Symptoms ...