Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a moderate - sized left pneumothorax with an overlying mid clavicular fracture and a fracture of the posterior third rib , visualized on the prior CT . There is a localized hematoma of the left lateral chest wall . There are linear opacities at the right lung base . There is a more confluent opacification at the left lung base . Small left pleural effusion . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal .
    OUTPUT:
    
1 . Moderate left apical pneumothorax , lateral left extrapleural hematoma , and small dependent left pleural effusion . 2 . Confluent opacity at left lung base , which could represent pulmonary contusion or aspiration in the appropriate clinical setting .