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A 44-year-old woman presents to the emergency department with pain. The pain is epigastric, sharp in nature, worse on lying flat and during inspiration. She has recently suffered a chest infection. She is not a smoker. On examination, she has diffuse inspiratory crepitations. Her oxygen saturation is 98% on room air. Her ECG shows widespread saddle-shaped ST elevation.Which of the following is the most likely diagnosis?