Thymoma: Symptoms & Signs

Medically Reviewed on 8/6/2021

Thymoma refers to a cancerous tumor of the thymus gland, which is a gland located in the front of the space between the upper lungs. Thymomas usually grow slowly and do not spread beyond the thymus.

Up to half of thymomas do not produce any symptoms or signs, and they are first diagnosed when physicians perform an imaging study of the chest for another reason. When symptoms do occur, these can include

Less commonly, associated symptoms and signs can include

Cause of thymoma

The exact cause of thymomas is unknown. They occur in both men and women, and there are no known risk factors that predispose a person to developing thymoma.

Other thymoma symptoms and signs


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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.