A 30-year-old male presents to the ED with complaints of sho…

A 30-year-old male presents to the ED with complaints of shortness of breath and chest pain that began after taking a  minor fall off of his bike. The symptoms have been persistent for the past 3 hours. Pain is increased with inspiration. He denies any constitutional symptoms of fever, cough, chills, or sick contacts. He is an avid biker and rides on a daily basis and did not consider this fall as significant. Additionally he does smoke ½ -pack of cigarettes per day.On physical exam he is tachypneic, with respiratory rate of 30, 94% saturation on room air. Ecchymosis present on left lateral ribs. Breath sounds are decreased in the left lung fields, and there is hyperresonance to percussion. The AG-ACNP obtains a chest x-ray (see the following x-ray): What is the diagnosis?