Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with chest radiographs from ___ , small right pleural effusion persists . Retrocardiac opacity has improved , with better visualization of the left hemidiaphragm . Right perihilar and basilar opacities persist , likely reflecting combination of atelectasis , aspiration or infection . No appreciable effusion on the left . No central vascular congestion or overt pulmonary edema . Top - normal heart size is stable . Tracheostomy tube in standard placement , unchanged .
    OUTPUT:
    
1 . Improved left retrocardiac opacity . 2 . Persistent right perihilar and basilar opacities and small right pleural effusion .