In season 8 of House M.D., Dr. James Wilson is diagnosed with thymoma.
Thymoma is a tumor arising from the epithelial cells of the thymus, an organ located in the upper chest behind the breastbone. In the series, Wilson discovers that he has a rare and serious form of cancer, leading him to reconsider how he wants to spend the time he has left.
The diagnosis drives the final season’s emotional storyline. Wilson initially keeps the news from House, but House eventually learns about it. Their response includes a final road trip and a deliberate decision to prioritize their friendship over hospital routines and professional obligations.
The diagnosis is often misremembered as lymphoma because Wilson is an oncologist and the story involves cancer. However, the specific disease named in the series is thymoma. The storyline also helps explain the choices made in the series finale, “Everybody Dies.”