Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . Subtly increased posterior basal opacity without definite frontal correlate as compared to prior examination is suspicious for infection . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
Subtly increased posterior basal opacity without definite frontal correlate as compared to prior examination is suspicious for infection .