Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen are bibasilar patchy opacities , slightly less than prior study . The previously seen nodular opacity in the left lower perihilar region is again seen . Remaining nodular opacities are not as well visualized today . No pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are stable .
    OUTPUT:
    
Slight decrease in bibasilar opacities which are concerning for pneumonia or aspiration . The left lower perihilar nodular opacity is again seen but less apparent . The remaining previously seen nodular opacities are not as well visualized today .