Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . There is no pleural effusion or pneumothorax . Hilar and mediastinal silhouettes are unremarkable . The aorta is tortuous with mild aortic arch calcifications . Heart size is top normal . Right lung base opacity is noted . Mild interstitial pulmonary edema and perihilar vascular congestion is present .
    OUTPUT:
    
1 . Right lung base opacity , likely atelectasis . 2 . Perihilar vascular congestion and mild cardiomegaly .