Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiomediastinal silhouette is unremarkable . Known right - sided rib fractures are not well visualized on the current examination . There is progressive lingular and right basilar opacity since ___ , also progressed since the most recent comparison . Small pleural effusions are stable . Improved pulmonary vascular congestion .
    OUTPUT:
    
Progressive right basilar opacity may represent atelectasis or developing infectious pneumonia . Left lower lobe opacity has slightly improved and previously reported volume overload has nearly resolved .