Mesotheliomas are mysterious mesothelial tumors, in that they are relatively exceptional, hard to diagnose, and the etiology and pathogenesis of the disease are not yet completely revealed. Every year, this difficulty captures the attention of many specialists in the field of medicine and biology. An increase in growth of mesothelioma morbidity in many countries of the world has been observed because of additional industrialization of society in the last few years. Keeping that in mind, this book has been published with the involvement of an international group of experts with extensive experience. Intended for biologists, this book discusses the recent progressive achievements of all forms of the distinct categories of mesotheliomas, in humans as well as in domestic animals, at a great methodological level. The book would be beneficial for health care employees, oncologists and also the students of medical institutions working in the field of mesotheliomas.