Mesothelioma is a form of cancer that is normally caused by asbestos exposure. Mesothelioma is cancer that occurs in the mesothelium. Mesothelioma: Mesothelioma is a type of cancer affecting the cells of mesothelial lining in the chest and abdomen. Mesothelioma cancer can develop in the tissues covering the lungs or the abdomen. Mesothelioma has also