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While his team helped remove the tumor from a six-year old girl this week - and also helped bring her parents closer together - House took a break from the hospital to assist Wilson with a risky procedure, an extreme way to shrink his tumor.
It carried a major possibility of death, as viewers watched Wilson struggle and battle for life. He also said some rather nasty things to his BFF, essentially saying someone like House deserves cancer, but someone like Wilson does not.
In the end, however, Wilson lived and we'll find out in a future episode whether his tumor has really shrank a lot.