Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were compared to previous exam from ___ and ___ . There is patchy opacity at the left lung base projecting over the spine on the lateral view . Elsewhere , the lungs are clear . Cardiac silhouette is enlarged but stable . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Patchy left base opacity compatible with pneumonia in the proper clinical setting . Recommend repeat after treatment to document resolution .