Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval development of an opacity at the left lung base concerning for pneumonia . The cardiomediastinal silhouette and hilar contours are stable . A right chest Port - A - Cath terminates at the lower SVC . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Interval development of opacity at the left lung base concerning for pneumonia .