Thymoma

What it means

A tumor originating from the epithelial cells of the thymus.

Malignant lymphomas that involve the thymus, such as lymphoblastic lymphoma and Hodgkin lymphoma (erroneously termed "granulomatous thymoma" in the past), should not be regarded as thymomas. Thymoma is an uncommon tumor, best known for its association with the neuromuscular disorder myasthenia gravis. Thymoma is found in 15% of patients with myasthenia gravis.

In everyday care

Most people with this sign do not have a rare disease — it appears in common conditions far more often. These general reference pages cover the same topic:

Rare diseases that can present with this9

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category