Credit: WENN Photo: Meredith Brings Derek Coffee, Season 6, Episode 13, "State of Love and Trust"

In last week's episode, little Drew was brought back to the hospital after having pectus excavatum surgery. Pectus excavatum is a congenital deformity in which the ribs and sternum do not grow properly, resulting in the chest appearing a bit caved-in. Usually it's not a big deal, but it can sometimes result in pain or cardiac and respiratory problems. After seeing that Drew was in a inordinate amount of pain, Meredith ran a CT scan and found that he had developed a perforated ulcer.  When she and Alex opened him up, they saw that that ulcer was on his interior duodenum — the first section of the small intestine. Alex suggested a Graham patch, which involves taking tissue from the stomach or liver to cover a perforation.

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