Mariska Hargitay was absent from Sunday night’s Golden Globe Awards and now we know why. Access Hollywood has confirmed that the Law & Order: SVU star is suffering from pneumothorax, or a partially collapsed lung.

"Mariska Hargitay has been sidelined with pneumothorax," the actress’s rep told Access, adding that "she will appear in all episodes for the rest of the season of Law & Order: SVU."

Pneumothorax can occur as a result of a chest injury including a puncture wound or broken rib but can also happen without these things. There’s no word on how the actress developed her case. Treatment includes oxygen and observation and surgery in some serious cases.

Hargitay was one of several nominated actors at last night’s Globes ceremony–including Milk‘s Sean Penn and James Franco–who did not attend.

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