Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are mildly displaced fractures of the left lateral fourth and seventh ribs with subtle non-displaced fractures of the left lateral sixth rib and left posterior ___ and 11th ribs . There is no definitive evidence of pneumothorax . A focal airspace opacity in the left mid lung zone is compatible with pulmonary contusion . There is a small amount of pleural fluid tracking towards the left lung apex . The cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Multiple acute left - sided rib fractures as detailed above with left pulmonary contusion and pleural fluid , but no definite pneumothorax .