A 22-year-old woman presents to the Emergency Department with sudden onset severe, sharp, left-sided pleuritic chest pain and shortness of breath that started one hour ago. She is tall and slim, a non-smoker, and has no significant past medical history. On examination, her respiratory rate is 24/min, SpO2 95% on room air. There is reduced air entry and hyperresonance to percussion on the left side of her chest. What is the most likely diagnosis?