Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No focal consolidation , pleural effusion , or pneumothorax is detected . Linear opacity at the left lung base likely represents atelectasis . Heart size is mildly enlarged as seen previously . Lung volumes are low . Pulmonary vascular congestion is increased without overt edema .
    OUTPUT:
    
Increased pulmonary vascular congestion without overt edema .