Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size remains moderately enlarged . A large hiatal hernia is re - demonstrated . The mediastinal and hilar contours are similar with atherosclerotic calcifications noted at the aortic knob . The pulmonary vasculature is not engorged . Blunting of the left costophrenic angle suggests a trace left pleural effusion with mild left basilar patchy opacity , likely atelectasis . No pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with small left pleural effusion and left basilar atelectasis . Large hiatal hernia .