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A woman in her 60s presented with 1 month of progressive dyspnea, watery rhinorrhea, and paroxysmal cough productive of clear, watery sputum. She was diagnosed with epidermal growth factor receptor (EGFR) mutation-positive lung adenocarcinoma at another institution 1 week prior to presentation and 3 weeks after the onset of symptoms. She was a never-smoker. She denied fevers and had completed a course of antibiotics for presumed pneumonia, without clinical improvement. She presented to the hospital due to increasing severity of her shortness of breath.