Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . Vague opacities at the right lung base are compatible with callus formation due to prior posterior right rib fractures . The lungs are clear of focal consolidation or effusion noting that they are slightly hyperinflated . Old left lateral rib fractures are also seen . Cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .