Q. A 42-year-old man presents to the emergency department with sudden onset shortness of breath, sharp chest pain that worsens upon inspiration, and mild hemoptysis. He mentions that he recently had a right leg cast removed after a tibia fracture 4 weeks ago. His vital signs are: temperature 98.6°F (37°C), blood pressure 135/85 mmHg, heart rate 110 bpm, respiratory rate 22 breaths/min, and oxygen saturation 89% on room air. An ECG shows sinus tachycardia and T-wave inversion in leads V1-V4. Based on the clinical presentation and history, what is the most likely diagnosis?