His lung is certainly punctured:
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Originally Posted by MLB.com
The sharp end of Castillo's busted bat hit Colvin under the collarbone. He was hospitalized for pneumothorax, which occurs when a person has air trapped in the space between the outside of the lung and inside of the chest wall. The air enters the space when there is a hole in the surface of the lung, which allows air to leak from the lung and into the space.
http://chicago.cubs.mlb.com/news/art...s_chc&c_id=chc |