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