House jokes about the fluid's shape, then the shape itself points the team to brain cancer.
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Every House moment featuring Gregory House, in story order. Played by Hugh Laurie.

Every House moment featuring Eric Foreman, in story order. Played by Omar Epps.

Every House moment featuring Robert Chase, in story order. Played by Jesse Spencer.

Every House moment featuring Allison Cameron, in story order. Played by Jennifer Morrison.