Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is a consolidative opacity in the right lower lobe , consistent with pneumonia . A patchy opacity is seen in the retrocardiac area which likely represents scarring or atelectasis , but could also represent a second site of pneumonia . Cardiomediastinal silhouette is slightly enlarged . There is no pneumothorax or pleural effusion . Visualized osseous structures are unremarkable . Cholecystectomy clips are noted in the right upper abdomen .
    OUTPUT:
    
Right lower lobe pneumonia . Patchy retrocardiac opacity is either atelectasis or a second site of infection . Follow up radiographs are recommended after treatment to ensure resolution of this finding .