Sarcomatoid mesothelioma is another form of malignant mesothelioma. It is responsible for between 7% and 20% of all mesothelioma cases. This type of mesothelioma can occur in most areas of the mesothelioid layer, and is classified by cell shape (oval-ish, irregular) and nucleus appearance (less visible, vague).
Symptoms are similar to other types of mesothelioma and depend on the area the disease begins and the stage of the disease. Sarcomatoid mesothelioma may be confused with other sarcoma types of cancer, and as a result may be more difficult to diagnose. There is some evidence to suggest that this type of mesothelioma may be even more aggressive and resistant to treatment than other types.
Biphasic Mesothelioma
Biphasic mesothelioma is diagnosed when a tumor is found in the patient that contains both epithelial mesothelioma cells and sarcomatoid mesothelioma cells—either mixed together or in separate areas of the tumor. Symptoms and treatment of the disease are similar to other types of mesothelioma and depend on the area the cancer begins, the stage the disease is in, and other factors.
Papillary Mesothelioma
Papillary mesothelioma is a very rare form of mesothelioma that is not well understood. It can occur in the heart, lungs, stomach or abdomen like other forms of mesothelioma, but also occurs in the ovaries and testicles. Some cases of papillary mesothelioma have been associated with asbestos exposure, others have not.
In a good portion of the cases that have been reported, the disease did not spread to other areas of the body, but it did show a high rate of recurrence. A uniform method of treatment has not been established, but surgery and chemotherapy have most often been used. Prognosis after treatment for this form of mesothelioma is often much better than other types of malignant mesothelioma.
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