Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is patchy increased opacity adjacent to the inferior right hilum . Lung volumes are low . There is no pleural effusion or pneumothorax . Heart size is normal .
    OUTPUT:
    
Patchy right infrahilar opacity , which may represent atelectasis , aspiration , or developing pneumonia . Recommend short - term follow - up radiographs to evaluate for progression .