Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there is new silhouetting of the right cardiac border with only vague opacity projecting over the cardiac silhouette on the lateral view . Elsewhere , the lungs are clear . Cardiac silhouette is top - normal . No acute osseous abnormalities .
    OUTPUT:
    
Loss of the right heart border suggestive of a right middle lobe process which could represent atelectasis versus pneumonia in the proper clinical setting .