Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a linear opacity projecting over the heart that is best visualized on lateral view , which likely represents atelectasis in either the RML or lingula . There are no pleural effusions or pneumothorax . Cardiomediastinal silhouette is within normal limits . No hilar lymphadenopathy . There is an irregularity in the lateral aspect of the right fifth rib that likely represents an old fracture as it was seen on the ___ CXR .
    OUTPUT:
    
1 . Linear opacity projecting over the heart on lateral view , likely representing right middle lobe or lingular atelectasis . 2 . Old right lateral fifth rib fracture .