Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a focal region of consolidation projecting over the anterior left sixth rib without localization on the lateral view . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is stable noting prosthetic mitral valve . No acute osseous abnormalities .
    OUTPUT:
    
Focal opacity projecting over the left lung on the frontal view , not definitely seen on the lateral view . If more definitive characterization desired , consider shallow obliques see if it persists .