Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent blunting of the right costophrenic angle which may be chronic pleural thickening ; however , trace pleural effusion is not entirely excluded . There is patchy right mid - to - lower lung opacity which may be due to infection . The left lung is clear . The cardiac and mediastinal silhouettes are stable . No pneumothorax .
    OUTPUT:
    
Subtle patchy right mid - to - lower lung opacities could be due to infectious process .