Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . There is subtle increased patchy opacity in the left mid to lower lung , which is seen posteriorly on the lateral view . Lungs are otherwise clear . Blunting of the left posterior costophrenic angle may represent small effusion . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
Subtle left mid to lower lung opacity compatible with left lower lobe pneumonia in the proper clinical setting .