Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right heart border is not as clearly seen as on prior CT , suggesting right middle lobe opacity . No other definite focal consolidation , pleural effusion , pneumothorax , or pulmonary edema is seen . The heart size is normal . Mediastinal contours are normal . No bony abnormality is detected .
    OUTPUT:
    
Right heart border not as well seen suggesting right middle lobe opacity , potentially atelectasis given lower lung volumes although infection is possible .