Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is moderate cardiomegaly overall unchanged compared to the prior exam . Calcifications are seen within the aortic arch . Prominence of the hilar and mediastinal contours are stable . There is no definite lobar consolidation , or pneumothorax . Low lung volumes result in mild bibasilar atelectasis . There is no large pleural effusion . No evidence of CHF .
    OUTPUT:
    
Mild bibasilar atelectasis . A superimposed infectious process ca n't be excluded in the appropriate clinical setting .