Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is again mild to moderately enlarged . The cardiac , mediastinal and hilar contours appear stable . There is no definite pleural effusion or pneumothorax . In addition to new fullness among central pulmonary vessels , suggesting mild vascular pulmonary edema , there is a focal right lower lung opacity that may represent atelectasis or possibly developing pneumonia .
    OUTPUT:
    
Findings suggesting mild edema and concern for developing opacity at the right lung base .