A 16-year-old girl with a history of asthma, ulcerative colitis (UC), allergic rhinitis, multiple food and environmental allergies, migraines, and autoimmune hypothyroidism presents to the emergency department with 2 days of worsening chest pain. She describes the pain as a sharp sensation localized to her left upper chest, which is exacerbated by deep inhalation. Review of systems is notable for 3 days of intermittent low-grade fevers and a dry cough, which has not improved with inhaled albuterol or fluticasone use. On physical examination the patient is pale. Her respiratory rate is elevated to 22 breaths/min, with oxygen saturation greater than 95% on room air. Her temperature is 101°F (38.3°C), heart rate is 130 beats/min, and blood pressure is 122/79 mm Hg. Her height is 64 in (162.8 cm) (51st percentile), weight is 114.6 lb (52 kg) (40th percentile), and BMI is 19.6. A thorough physical examination is performed, which is...
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