In the tv show House, Dr. House is a diagnostic genius with a team of doctors under him. Every episode deals with a new mystery case which takes the entire episode for the team to solve.
Obviously, they are dealing with strange cases every time which is why they are so difficult to solve, but how is it that every case they get is such a rare mystery? Is there some sort of process where these patients have already been to other doctors who couldn't diagnose them? I know there are cases in the show where the patients were specifically referred, but in the majority of the cases, it seems like it goes unexplained.