Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal contours are stable in appearance . Small right upper lobe nodular opacity at level of second anterior rib is similar compared to earlier radiographs . Minimal bibasilar opacities are improved compared to prior radiographs . Mild elevation of left hemidiaphragm is unchanged . No pleural effusion or acute skeletal findings .
    OUTPUT:
    
No definite acute pneumonia , but CT would be more sensitive for detecting early signs of infection , especially considering the presence of chronic chest radiograph abnormalities in this patient .