Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . The lungs are clear . There appears to have been resolution of the previously described left apical pneumothorax . There is no pleural effusion . Again are noted fractures of the lateral aspects of the left ribs 4 through 6 . Additionally , on the lateral view , there is a comminuted fracture of the left humerus with a butterfly fragment and angulation of the major fracture fragments which is currently sitting within a cast .
    OUTPUT:
    
1 . Rib fractures and comminuted left humerus fracture status post casting . 2 . Resolution of previously described pneumothorax .