Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to chest radiograph from ___ , lung volumes have decreased and remain low . Linear opacity at the right lung base likely represents chronic atelectasis or fissural thickening . Possible effusion on the right , likely moderate . There are no new focal consolidations . There is no pneumothorax . Moderately cardiomegaly with pulmonary vascular congestion suggests mild heart failure . Mediastinal and hilar contours are stable .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Low lung volumes . Probable moderate right effusion . Moderate cardiomegaly with pulmonary vascular congestion suggests mild heart failure . 3 . Right basilar linear opacity likely represents chronic atelectasis or fissural thickening .