Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is hazy opacity obscuring the left heart border . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Note is made of a probable small hiatal hernia .
    OUTPUT:
    
Opacity in the lingula , compatible with pneumonia in the proper clinical setting .