Grey's Anatomy, Season 8

Meredith:
[voiceover] When you've tried everything but that headache don't go away, you can't stop coughing, the swelling don't go down. That's when you turn into a professional. As surgeon we spend years developing skills of perception that allow us to see exactly what the problem is. Trouble is sometimes all that time spent developing those skills of perception can leave a person with an extremely narrow point of view... And how are you supposed to argue with someone who has science on their side?