www.mesotheliomaandasbestoscancer.com Mesothelioma is a rare, deadly form of cancer which can occur in a number of types. Mesothelioma is caused by exposure to asbestos, a group of natural fibres which are extremely dangerous if inhaled as fibres. When fibres are inhaled they become lodged in the alveoli of the lungs and over a period of time these fibres make tissue and cells abnormal and cause mesothelioma cancer. Pleural mesothelioma is the most common form of mesothelioma cancer, accounting for approximately 75% of all mesothelioma cases.