Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes , which accentuate bronchovascular markings . There is no pleural effusion . No pneumothorax is seen . Hilar and mediastinal silhouettes are unchanged . Aortic arch calcifications are noted . Heart is mildly enlarged . Left lung base opacities are new since prior .
    OUTPUT:
    
Low lung volumes . Mild left lung base opacities , likely represent atelectasis .