Lexie storms in to where Callie is sorting supplies, and when Callie says she doesn't need any help Lexie takes to attacking a roll of gauze and ripping it apart. [Hospital supplies are expensive! I know from my last bill and here she is just wasting them! Ack! -- Angel] She wants to talk about Mark, while Callie just wants her to knock it off with the ripping, but Lexie doesn't even hear her and rants about how Mark won't talk to or look at her, and how even if they broke up they still have to work together. She tries to say she's going to become a plastic surgeon but Callie assures her awesomely that she's clearly not, and Lexie gives in pretty easily. She rants some more before telling Callie she doesn't know what to do, and Callie admits that Mark isn't being fair. When Lexie argues that a one night stand isn't a big deal, Callie agrees that it's true and then lets an unfortunate detail slip -- that Mark didn't just sleep with Addie once. Lexie is appalled and storms out while Callie curses herself.
Alex and Arizona are looking at the scan and no matter how hard they look, they can't find anything wrong with Brad. Alex is baffled and argues that no matter how lame a kid is, he doesn't want to miss class to go to the hospital. Look, I loved school but if I had a chance to miss it during the day and if I wasn't having anything horrible done at the doctor, I was always excited for it. So, actually, was Arizona, who happily tells him about how much she loved the hospital until she catches his look and has him go back over the symptoms. After a bit, Alex thinks that maybe he has crazy stomachsymptomenia, which would fit all the symptoms and nothing showing up on the scans. The problem is that the only way to diagnose it is with exploratory surgery, and Arizona reminds Alex that if Brad's dad had a fit about a CT, he won't go for that.