House has gotten all the information he needs from Irene's fake dead mom. He returns to the classroom and triumphantly tells the Numbers to start the patient on L-dopa and bromocriptine -- Irene has Parkinson's, as did her mother. Parkinson's makes you hallucinate dead people now? Really? As if Michael J. Fox and his fellow sufferers didn't have enough to deal with. Geez.
Cameron the shit-stirrer approaches Cole in the hall and asks him how House is treating him. She says word around PPTH is that House has been treating him extra-special crappy. If I were Cole, I'd be a little concerned about the fact that in this giant hospital with all these employees, the office gossip is me and how my boss treats me. That grapevine's got one hell of a focus. But Cole shrugs it off, figuring House is like this to everyone. Cameron tells Cole to take a stand against House, saying House will respect Cole for it. Also, Cameron wants to win that hundred bucks. Baby needs a new pair of shoes.
Kumar the Butcher is stabbing away at a screaming, squirming Irene, trying to force an IV line into her arm. Finally, 13 steps in to put the line in herself, ordering Kumar to hold Irene down. Kumar grins and jumps on top of the patient. He's a weirdo. Or maybe he's only smiling in Irene's hallucinations, since we then see 13 grinning as she plunges a huge needle into her arm.
Irene wakes up to find 13 hovering over her, reassuring her that she was just having a nightmare. Maybe, but Irene's arm pain was very real, as is the blood pouring out of holes in it. 13's kind of a bitch, stabbing Irene so hard in her dream that the marks stayed when she woke up.
The Numbers are in the conference room now. CTB tells us that lesions are not a symptom of Parkinson's, so that's out. Time to start over again! Weird Beard continues to endear himself to me when he suggests vasculitis, the original lupus. It's not vasculitis, of course, but the suggestion starts off another pissing match between Weird Beard and PS when PS says vasculitis is a ridiculous conclusion to reach based on Irene's symptoms, and Weird Beard clearly sucks as a doctor, and Weird Beard countering that retinal vasculitis fits Irene's symptoms. Weird Beard even has a metaphor to back his diagnosis up. As for PS, he thinks Irene has acute intermittent porphyria, which we all know is wrong since someone on this show has had it before. Weird Beard says that while that is also a possible diagnosis, the treatment for AIP could kill Irene's kidneys if they're wrong. The treatment for vasculitis, on the other hand, is much safer if they're wrong, which is good, since they almost always are. House agrees, and sends them off to treat Irene for vasculitis while they test her for AIP. He tells Cole to check his email for some humiliation action, because why have your fellows doing things to save a patient's life when they could be looking at embarrassing emails?