- Mesothelioma is a malignant tumor of the mesothelium caused by exposure to asbestos fibers. Exposure can be due to the person's working environment. It is a serious cancerous tumor and hence the outcome of the disease can cost the person's life. So, lawsu... : http://www.mesothelioma-attorney-search.com/mesothelioma-attorney-articles/mesothelioma_lawsuit_directories.html