It is in the chest and abdominal cavities, as well as in the cavity around the heart (pericardial sac), where is a layer of specialized cells called mesothelial cells. These cells also surround the outer surface of most internal organs. Mesothelium is what this cells form!
The mesothelium performs a (protective) function for the internal organs by producing a some fluid lubricating that lets the organs to move around. Like, this fluid makes it easier for the lungs to move inside the chest while a person breathes. The mesothelium of the abdomen is known as the peritoneum, and the mesothelium of the chest is called the pleura. The pericardium refers to the mesothelium of the pericardial cavity.
There are three primary types of malignant mesotheliomas:
Epithelioid. About 50% to 70% of mesotheliomas are of this type and have the best outlook for survival.
Sarcomatoid. Approximately 7% to 20% of cases are of this type.
Mixed/biphasic. From 20% to 35% of mesothelioma cases fall into this category.
Approximately three-fourths of all mesotheliomas begin in the chest cavity and are known as pleural mesotheliomas. Peritoneal mesotheliomas begin in the abdomen, and make up around 10% to 20% of all cases. Mesotheliomas arising in the cavity around the heart are quite rare.
Source, edited from: answers.com
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