Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is mildly enlarged . The pulmonary vasculature is unremarkable . There is no pleural effusion or pneumothorax . Minimal left infrahilar opacity is noted , which in the appropriate clinical context , may represent residual pneumonia . No definite sequela of traumatic injury are noted .
    OUTPUT:
    
1 . Possible opacity in the left infrahilar region may represent pneumonia in the appropriate clinical context .