Watch Grey's Anatomy Online: Season 19 Episode 10Paul Dailly at .
What was Catherine's big case?
On Grey's Anatomy Season 19 Episode 10, she returned to Grey Sloan Memorial with a medical mystery.
Lucas and Blue joined in the fun and admitted the case made them queasy.
Meanwhile, Amelia treated a possible cancer patient with a family that was too little supportive.
Elsewhere, Owen took his medical future into his own hands.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.