Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine AP portable view of the chest was obtained . There are low lung volumes . Cardiomediastinal silhouette appears mildly enlarged with sharp margins , likely in part due to low lung volumes . If high concern for mediastinal injury , CT would be recommended . Lungs are clear without focal consolidation . No pleural effusion or pneumothorax seen . No displaced fracture seen .
    OUTPUT:
    
Low lung volumes which likely accentuates the cardiomediastinal silhouette . If concern for mediastinal injury , CT . No displaced rib fracture is seen , although if clinical concern for rib fracture is high , suggest dedicated rib series .