Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , there is a new heterogeneous opacity at the right lung base with suggestion of a small right pleural effusion . Lungs are otherwise notable for increased interstitial markings bilaterally likely due to chronic disease as seen on prior CT scan . The cardiac and mediastinal contours are unchanged . No pneumothorax . Old bilateral rib fractures are again seen .
    OUTPUT:
    
Chronic lung changes with more confluent right basilar opacity worrisome for pneumonia with possible small adjacent pleural effusion .