Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Heart size is mildly enlarged . Widening of the superior mediastinum is likely due to supine positioning and low lung volumes . Crowding of the bronchovascular structures is present . Minimal patchy opacity in the left upper lung field may reflect an area of contusion or aspiration . No large pleural effusion or pneumothorax is present . No acute osseous abnormalities detected . Surgical anchors overlie the right humeral head .
    OUTPUT:
    
Low lung volumes . Patchy opacity in the left upper lung field is nonspecific , but may reflect an area of contusion or aspiration .