Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As seen on prior , there is a focal opacity projecting over the spine inferiorly on the lateral view . On the current exam , it is difficult to localize to the left or the right on the frontal view . Superiorly , the lungs are clear . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Focal opacity overlying the spine on the lateral view compatible with pneumonia in the proper clinical setting , similar to previous exam from 2 days prior .