Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral radiographs of the chest . Compared to the prior examination , there is some increased opacity in the right lower lobe . The lungs are otherwise grossly clear . Heart size is normal and the hila appear unremarkable . There are aortic calcifications with unfolding of the aorta . There is no pneumothorax or pleural effusion . No chf . Probable background hyperinflation .
    OUTPUT:
    
Subtle right lower lobe opacity which could be secondary to atelectasis , but pneumonia or aspiration can not be ruled out . Attention should be paid on followup examinations .