Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged , similar to prior examination . In the right infrahilar region , there is a patchy opacity , in the appropriate clinical context , which may represent a right middle lobe pneumonia . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Possible right middle lobe pneumonia in the appropriate clinical context .