House Season 6 Episode 6 - Known Unknowns (Megavideo) 

House, Cuddy, and Wilson go to a medical conference and meet an old friend, while the team deal with a girl whose appendages have swollen but she refuses to tell them the truth about the events leading up to her illness.
Keywords: house, season 6, episode 6, 6x06, known unknowns, megavideo, link