A 31-year-old man comes to the physician due to a 2-day history of sharp left-sided chest pain that worsens with coughing or deep inspiration. Four days ago, he recovered from a short illness in which he had coryza and low-grade fever. Physical examination shows a left-sided friction rub. Cardiac examination is normal. X-ray of the chest shows a small pleural effusion on the left. Serum creatine kinase is 100 U/L (NR 55-170). Which of the following is the most likely diagnosis?
Costochondritis
Pneumonia
Pneumothorax
Pulmonary embolism
Viral pleurisy
