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 focal consolidation , pleural effusion or pneumothorax . Hilar and mediastinal silhouettes are unchanged . Mild cardiomegaly persists . Mild perihilar vascular congestion is noted . Retrocardiac opacities likely represents atelectasis .
    OUTPUT:
    
1 . Mild cardiomegaly and perihilar vascular congestion . 2 . Left lung base opacities , likely atelectasis .