succeeds and Ian does not develop liver damage, but instead skips the next two symptoms and goes into respiratory distress. Thinking it could be cancer, House includes Wilson in the differential. Wilson suggests Kawasaki disease, but before the team begins tests, they discover a mass in his heart. Postulating that Ian, being younger than Esther, has a stronger immune system and can last longer while under assault from this unknown disease, House orders a heart biopsy on Ian. Wilson, recognizing House's ongoing grapple with Esther's case, warns him not to become obsessed, using Moby Dick as an allusion. During the biopsy, as House collects the sample from Ian's heart, the catheter induces cardiac arrest in Ian, prompting an enraged Cuddy to pull House off the case and ban him and his team from performing any more tests on Ian. However, House refuses to give up, stating that they still have the mass obtained from the biopsy and can perform the tests on that. The team suggests seven likely diseases, but only has enough tumor mass to perform three tests. First the team tests for Histiocytosis, but it is negative. Next they test for Tuberous sclerosis but that is negative also. Desperate and with only one remaining test, House wanders the hospital trying to think of his next move, when he hears from Wilson that he won the poker tournament. Wilson won only because he had kept his hole cards, two aces, hidden the entire game, prompting House to have an epiphany. He realizes that the disease also remained a secret until the end because they biopsied the colon before the disease had reached the Gastrointestinal tract. House then orders his team to perform the final test on the first disease suggested: Erdheim–Chester disease. In dismay, the team pleads, telling him they cannot waste their sample on a test for a disease they know he's negative for. House explains his reasoning about the disease not reaching the GI tract and orders the test anyway. The once-skeptical team is pleased when the test turns out positive, Ian is saved, and House finally discovers what killed Esther. The episode ends with House and Wilson playing poker and joking as they did in the beginning of the episode. References External links "All In" at Fox.com House (season 2) episodes 2006 American television episodes