Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright frontal view of the chest . As compared to the prior chest radiograph , the lung volumes remain low . Cardiomegaly and mild tortuosity of the descending aorta is stable . The mediastinal contours appear normal . Atelectasis of the right lung base persists ; otherwise , there are no focal opacities or overt pulmonary edema . No significant pleural effusion or pneumothorax .
    OUTPUT:
    
Relatively unchanged appearance of the heart and lungs since ___ . Cardiomegaly , low lung volumes and atelectasis of the right lung base .