Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is normal . Minimal opacity at right lung base is probably atelectasis and less likely an early focus of pneumonia .
    OUTPUT:
    
Minimal right basilar opacity , favoring atelectasis over focal pneumonia .