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When your care team determines your diagnosis, they also assess what stage of cancer you have. Staging describes:
Size of the tumor
Location of the cancer
Whether the cancer has spread and, if so, to where
When you are diagnosed with a mediastinal mass, your doctor determines what stage it is.
Staging the cancer helps your doctor tailor a treatment plan. Factors that determine the stage include the size of the tumor, whether cancer has spread to other parts of the body, and if so, where.
Stages of Thymoma For thymoma, the findings from the diagnostic test your doctor uses also determine the stage:
Stage I: Noninvasive cancer contained inside the layer (capsule) surrounding the thymus gland
Stage IIA: Cancer growing into the capsule
Stage IIB: Cancer growing beyond the capsule into surrounding tissue
Stage III: Cancer growing into nearby organs and tissues, including the sac surrounding the heart, the lungs, and the main blood vessels leading into and out of the heart
Stage IVA: Cancer widespread around the heart and lungs
Stage IVB: Cancer in other areas of the body, including the lungs, liver, and bones
A cancer diagnosis and its staging help you and your doctor make decisions about your treatment plan. This information is also helpful in determining your prognosis (probable outcome based on the experience of others).
The Stanford Medicine Online Second Opinion program offers you easy access to our world-class doctors. It’s all done remotely and you don’t have to visit our hospital or one of our clinics for this service. You don’t even need to leave home!