Mesothelioma Asbestosis Asbestos exposure is the reason for Cassylawn both mesothelioma and asbestosis. Both are long-term health issues. Mesothelioma, which is a cancerous disease, is different from asbestosis. A biopsy is the main way to diagnose pleural mesothelioma. Doctors examine a small piece of pleural tissue under a microscope. Symptoms Mesothelioma...