Foreman exits the operating room to tell Stacy that the surgery went well, and that she can see Mark in the recovery room now. Stacy leaves to do that. Foreman tells House that the surgeon didn't find anything but a distended bladder, which I believe is what your mother always threatened would happen to you if you held it too often. It doesn't explain any of Mark's symptoms, leading Foreman to agree with Cameron that Mark is fine. House asks for a video of the surgery.
House spends his night eating pizza, drinking, and watching TV. It would be the perfect evening if the TV show wasn't a close-up of Mark's insides. House watches and paces around the office and twirls his cane and watches again. He decides that his TV screen isn't sharp enough to see the finer details, and steals the ob-gyn department's plasma screen in an awesome bit of continuity. The clearer screen shows him what he's looking for, and he calls "Dr. Mandingo" to the "plantation house." Oh, dear.