Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volume loss . Confluent right lung base opacity is more conspicuous since prior exam . There is no pleural effusion or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . The aortic arch calcifications are again noted . Mild tortuosity of the descending aorta is present . Moderate cardiomegaly is stable . Perihilar vascular congestion is present . Partially imaged upper abdomen is unremarkable .
    OUTPUT:
    
1 . Confluent right lung base opacity , increased in conspicuity since ___ exam , which may represent atelectasis , assymetric edema or infection in the appropriate clinical setting . 2 . Moderate cardiomegaly and perihilar vascular congestion , unchanged .