Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette . There is subtle left infrahilar opacity , concerning for pneumonia . No definite focal consolidation , pleural effusion , or pneumothorax is identified . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Left infrahilar opacity concerning for pneumonia .