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Thymoma (cont.)

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How is thymoma diagnosed?

If a thymoma is not causing symptoms, it is sometimes identified incidentally, meaning it is found on an imaging test of the chest (for example, X-ray, computerized tomography or CT scan) that is performed for another reason. If symptoms are present, chest X-rays or other imaging studies, such as CT scans or magnetic resonance imaging (MRI) scans, are typically carried out to identify the source of the symptoms. While a mass in the anterior mediastinum can be seen on imaging studies, the definitive diagnosis can only be established when the mass is either removed surgically and examined by a pathologist or when a biopsy (surgical removal of a small portion of tissue for diagnostic purposes) is taken. Microscopic examination of the tumor tissue is necessary to confirm the diagnosis of thymoma or thymic carcinoma.

What are the stages of thymoma?

The stage of a tumor refers to the extent to which it has spread to other local organs and tissues or to distant sites throughout the body. There are two commonly used staging systems for thymoma, both of which classify the tumors as Stage 1 through Stage 4, depending upon the extent of spread and the degree of tissue invasion. While there are some differences in the two methods used to stage thymomas, a Stage 1 tumor represents an encapsulated tumor (surrounded by a capsular structure) that has not spread outside of the thymus gland. Stage 4 represents the opposite extreme, in which invasion and spread to distant organs has occurred.

What is the treatment for thymoma?

The treatment for thymoma is primarily surgical removal. The success of surgical treatment depends upon the particular characteristics of the tumor and its precise location; tumors that can be completely removed have a higher surgical cure rate. In certain cases, particularly if there has been spread to distant organs or invasion by tumor cells of the organs in the chest, radiation therapy and chemotherapy have been used as an adjunct to surgical resection. There have been no studies to show which one of these treatments is superior. Chemotherapy is generally used for metastatic thymoma and thymoma that cannot be surgically removed.


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Source: MedicineNet.com
http://www.medicinenet.com/thymoma/article.htm

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