Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiographs from ___ , lung volumes have slightly improved . Retrocardiac opacification continues , which likely are represents atelectasis , though aspiration or infection can not be excluded . Probable small left pleural effusion is stable . No appreciable effusion on the right . No new focal parenchymal consolidation . No central vascular congestion or overt pulmonary edema . Moderate cardiomegaly is stable . Right PICC line tip terminates in the right atrium and should be withdrawn approximately 2 .6 cm . Tracheostomy tube is in good placement .
    OUTPUT:
    
1 . Slightly improved lung volumes since ___ . Otherwise , no significant interval change . 2 . Right PICC line tip terminates in the right atrium and should be withdrawn approximately 2 .6 cm .