Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . On the lateral view , there is subtle opacity projecting over the lower thoracic spine which likely localizes to the left on the frontal view . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Subtle patchy opacity at the lung base , likely on the left , which could represent pneumonia in the proper clinical setting .