Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs . There is a focal opacity in the lingula , not present on prior radiographs . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
Focal opacity in the lingular could be either a small infarct from a pulmonary emboli . Pneumonia is also possible . Findings were discussed by Dr . ___ with Dr . ___ by phone at 7 :41 a .m . on ___ .