Mesothelioma has 2 types and 2 properties. malignant mesothelioma and benign mesothelioma. Let's learn about malignant mesothelioma before and after that we just point to the benign.
 
A cancerous tumor of the mesothelium is called a malignant mesothelioma, although this is often simply shortened to just mesothelioma. Mesotheliomas can start in 4 main areas in the body.

    * Pleural mesotheliomas start in the chest cavity. They account for about 3 out of 4 mesotheliomas.
    * Peritoneal mesotheliomas begin in the abdomen. They make most of the remaining cases.
    * Pericardial mesotheliomas start in the cavity around the heart and are very rare.
    * Mesotheliomas of the tunica vaginalis are very rare tumors that start in the covering layer of the testicles, which is actually an outpouching of peritoneum into the scrotum.

Malignant mesotheliomas can also be classified into 4 types based on how the cells are arranged when looked at under a microscope:

    * Epithelioid: About 50% to 60% of mesotheliomas are of this type. It tends to have a better outlook (prognosis) than the other types.
    * Sarcomatoid (fibrous): About 10% to 20% of mesotheliomas are of this type.
    * Mixed (biphasic): These mesotheliomas have both epithelioid and sarcomatoid areas. They make up about 30% to 40% of mesotheliomas.
    * Desmoplastic: These are rare.

That bit of knowledge about malignant mesothelioma, may be useful and helpful
adapted from cancer.org

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