Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is a vague opacity in the right lung base at the cardiophrenic angle which is slightly more conspicuous as compared to previous exams but may be secondary to summation of shadows . In the lateral view , there may be very minimal increase in opacity of the anterior cardiophrenic angle , stable to minimally increased compare to prior , likely artifactual . No other focal opacities identified . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Slight increase in relative opacity at the right cardiophrenic angle is more likely artifactual and summation of overlapping shadows , but in the appropriate clinical setting and early right middle lobe pneumonia is not entirely excluded , although felt less likely .