Woman with dyspnea and history of systemic lupus erythematosus

32-year-old woman with history of pleurisy and systemic lupus erythematosus presented to the emergency department with shortness of breath and pleuritic chest pain, acutely worse over one day after a six hour flight three days prior. She became dyspneic walking from her hotel bed to the bathroom. She endorsed 3 weeks of right lower leg cramping. She denied history of blood clots. She appeared tachypneic and speaking in short phrases upon arrival. A bedside ultrasound was performed, see Figures. Vitals: T: 98.3 F, HR: 130, BP: 142/88, RR: 24, oxygen saturation 97% on room air.