Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are slightly lower than on the prior study , accentuating perihilar structures . The cardiomediastinal silhouette is stable . There is no pleural effusion , pulmonary edema , or focal consolidation concerning for pneumonia . Multiple old left - sided rib fractures are again seen .
    OUTPUT:
    
Low lung volumes . Otherwise , no acute cardiopulmonary process .