Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are normal . Subtle opacity at the right costophrenic angle is noted as well as in the retrocardiac space . There is no pneumothorax . There may be trace pleural effusion on the right .
    OUTPUT:
    
Subtle right costophrenic angle and retrocardiac opacities , with trace pleural effusion may represent pneumonia .