House and Foreman do some secret brain radiation on Hadley. Good thing Cuddy is so busy exacting petty revenge on House that she isn't noticing all the extra MRIs and cancer treatments going on under her nose. Not to mention that Haley is unconscious for the procedure, which is supposed to require the skills of an experienced anesthesiologist or at the very least, Chase. But no, Chase and Cameron will spend the 100th episode of the show they spent three seasons being a big part of totally off-camera so that we may have more time for Hadley. Foreman admits to House that he feels terrible. House says he should have realized that this was one of the possible outcomes of switching the drugs. Foreman says he was willing to take the risk to his own career; it never occurred to him that Hadley would be affected instead. Everyone else who was on the drug was just fine. Um, except for Janice and her nausea, but I guess Foreman forgot about that. Insensitive prick. House finds it ironic that Foreman did this because he loves Hadley, but he never took her health into consideration. With that, they get ready to do some radiating.
Kumar and Taub, meanwhile, are sending Dana in for her umpteenth MRI. They're really pushing things now. The MRI has been dormant for so long; soon it will strike, and strike hard. Also, I see that they've put little gloves on Dana's hands, presumably to stop her from boring holes in her own skull. Good call, and probably less embarrassingly obvious than the dog cone collar I suggested. Kumar wants to know why he and Taub are the only people doing their job today. Taub says that whatever's going on involves House, Foreman, and Hadley, meaning it's either "dumb, dangerous, or tragic or a combination." He's happy to be left out of it. Taub speaks the truth! I wish I was left out of it, too. Kumar finds the He-mangioma and says House was right. Maybe not: Taub sees another mass in Dana's spine, and then several more masses all over her body. Whatever that means, judging by the look on Taub and Kumar's faces, it isn't good.
Guess who has mesothelioma? Besides all those people who worked with asbestos that I keep seeing class action lawsuit ads for, it's Dana! House enjoys pointing out that if only cancer researchers didn't quit their jobs to take up cooking, there could be a cure for Dana. Ah, the irony! Then again, since there are still about twenty minutes left in the show, it's probably not mesothelioma anyway. Kumar just wants to know what's going on with Hadley and Foreman, completely missing the fact that the masses have grown in Dana's body ridiculously fast for mesothelioma. House tells the two to get Wilson to do a biopsy, but Kumar says he won't do a thing until he finds out what's going on with Hadley and Foreman. He says they're entitled to know since Hadley and Foreman are their colleagues. Taub isn't quite so willing to take a stand. He goes off to get Wilson. That's right, Taub! Kumar thinks that inserting himself into Hadley and Foreman's storyline will get him extra camera time, but you know the truth: ain't no one getting extra camera time except Hadley, so there's no point in trying. Kumar stays behind and asks House if Hadley's headache is more than a headache.