Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right IJ terminates within the right atrium . Again seen is an opacity at the right apex , slightly increased since prior study . There is now heterogeneous opacity at the left lung base . The cardiomediastinal silhouette and hilar contours are stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Right IJ terminates within the right atrium . Unchanged opacity at the right lung apex , slightly increased since prior study . 2 . Heterogeneous opacity at the left lung base , which may be related to low lung volumes , but CTA chest is recommended to rule out an infectious process .