Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . There are somewhat increased interstitial markings bilaterally , similar or slightly worse since the study of ___ . The cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax . There is evidence of prior rib fractures on the left .
    OUTPUT:
    
1 . Somewhat increased prominence of interstitial markings bilaterally since the prior study but not as prominent as the study of ___ . This is of unclear clinical significance , may in part relate to differences in technique with possible minimal underlying interstitial edema . Atypical infection not entirely excluded in the appropriate clinical setting . No focal consolidation .