A 25-year-old woman with no previous medical history presents to the hospital with a 24-hour history of breathlessness on exertion. She is a non-smoker. Chest examination and chest radiograph are normal; she has a sinus tachycardia of 110 beats/min, tachypnoea (respiratory rate 22 breaths/min) and is mildly hypoxic, and hypocapnoeic (pO2 9.8, pCO2 3.1, pH 7.51).
What is the most likely diagnosis? *This image case is from Docplexus editorial team for educative purpose only. Source: Acute Medicine
