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A 26-Year-Old Woman With Dyspnea on Exertion. CASE PRESENTATION: A 26-year-old woman with no significant medical history was referred for 5 months of dry cough, dyspnea, presyncope and chest pressure, and nausea with exertion. The family history was notable for thromboembolic disease in the setting of malignancy and autoimmune disease. She was not on any medications. She is a never smoker and did not use recreational drugs. She had no work-related exposures. Her BP was 95/67 mm Hg; her heart rate was 93 beats per minute, and oxygen saturation was 98% on room air. Lung fields were clear to auscultation. She had a prominent P2 heart sound. There was no jugular venous distension or edema. There was no clubbing, rash, or synovitis.