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A 17yo girl presents with LUQ abdominal pain and vomiting x 2 days, and SOB x 1 day. Past medical history includes mild intermittent asthma, treatment for community-acquired pneumonia one month ago, and an MVA 1 year ago – she received head CT that was negative and was admitted and observed overnight at that time. Her CXR is below.

Diaphragmatic Hernia

Which is true of her diagnosis?