House stops by the Gift Shop, which is having a sale on B-plot wrap-ups. The New Jersey Lolita stops by and is happy to see House. She quickly says that she isn't stalking him (which is probably the first sign that she is), saying her dad lost his medicine (a.k.a. she threw it down the sink for an excuse to go back to PPTH), so she's back for a refill. While she's there, though, she's like to know why House won't return her calls. House says he will -- "in a couple years." Teen denies calling House for a date, saying she was doing it to thank him for treating her father. I think one call from the actual patient would have sufficed there. Before leaving, she adds that House doesn't have to wait a few years to call her back -- she'll be an adult in less than six months. And what better way to celebrate one's newfound adulthood by hooking up with a cripple more than twice your age! As she walks away, House checks out her red thong-covered ass. Class-say. He enjoys the view for a while, then looks thoughtful.
House reports to the lab where the Cottages, including Cameron, are busy testing and discounting all their differential diagnoses: "Congo red!" Congo Red is a solution that, when added to cells, stains something or other and proves amyloidosis. Foreman doesn't think this test is necessary, as they already proved that Ezra's heart was never affected, which is a hallmark symptom of amyloidosis. House says it was; they just never realized it because they didn't push him hard enough during the stress tests, which it seems are pretty much useless.
Chase comes up with the Congo Red stain and prepares a slide in record speed. Guess what? It's positive for amyloidosis. Chase was right after all! The Cottages are amazed. Foreman asks House where he pulled that out of. House does not respond that he pulled it out of a teenager's ass, but he might as well have. Anyway, amyloidosis is treatable, so it looks like Ezra's going to be fine and life will be awesome and long for him after all --"Oh God," Chase says. Ezra has protein type AA. This must be bad, as everyone makes sad faces. House hands Cameron the candy bar he got at that gift shop and goes off to shoot the horse.