Anteroposterior chest X-ray and CT scan chest demonstrating "missed pneumothorax". Initial Anteroposterior chest X-ray of the intubated patient, illustrating diffuse air space opacities in the left lower lung field. Underlying pneumothorax was suggested because of a visible pleural stripe in the lung apex and a highly visible cardiophrenic sulcus (Panel A). Chest CT scan illustrating a left-sided pneumothorax with underlying lung collapse (Panel B). Adapted from Omar et. al. .