Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lingular opacity is not significantly changed since the prior study . There is atelectasis at the right lung base . The cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Persistent lingular opacity which could represent atelectasis or incompletely treated pneumonia .