Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Moderate cardiomegaly is unchanged . Hilar and mediastinal silhouettes are unremarkable . Aortic arch calcifications are again seen . Mild pulmonary vascular congestion is noted . Bibasilar opacities , likely represent atelectasis .
    OUTPUT:
    
Bibasilar opacities , likely atelectasis .