Mesothelioma and Non Asbestos Exposure Mesothelioma is most often found in the lung's lining (pleura) and abdomen (peritoneum). The rare cancer can also develop in the heart's lining (pericardium) or in the testes. Asbestos is the main mesothelioma-related risk factor. However, some people diagnosed with mesothelioma do not have an
