Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An opacity is seen superior to the major fissure on the lateral view overlying the heart . It can not clearly be identified on the frontal view and likely represents either a right middle lobe or lingula pneumonia . The cardiomediastinal silhouette is stable . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Right middle lobe or lingula pneumonia , recommend followup radiograph after treatment to ensure resolution .