Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The small left pneumothorax seen on the prior CT is appreciated as a subtle lucency at the apex of the left lung . The nondisplaced rib fractures seen on the chest CT are not appreciated on the current radiograph . Heart size and mediastinal contours are normal . There is no pleural effusion .
    OUTPUT:
    
Tiny left apical pneumothorax . Left rib fractures not clearly visualized .