Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Given differences in positioning and technique , there has been no significant interval change . The lungs are essentially clear aside from linear left basilar opacity which is likely atelectasis . Cardiomediastinal silhouette is stable . Linear calcification again projects over the lateral aspect of cardiac silhouette .
    OUTPUT:
    
No acute cardiopulmonary process , no significant interval change .