Benign Mesothelioma is a disease whose only known cause is exposure to Asbestos. When Asbestos fibers are inhaled, they can lodge in the cells of the Mesothelium, a membrane that lines the abdominal cavity, heart and lungs. Find out more about benign Mesothelioma and other cancers that affect these areas, at our website. If you have been exposed to Asbestos in the San Francisco area, we can help.