After being blackballed by most of the surgeons, Meredith uses Lexie to spark Dereks interest in her patients rare brain tumor case and, in secret, gives guidance to April with Baileys clinical trial; Callies wish for Arizona and Mark to form a friendship comes to fruition and she realizes its more irritating than helpful; Alex and Teddy research alternative surgeries for a very superficial patient; and Callie and Cristina struggle with a very difficult spinal surgery.