Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left mid to upper lobe opacification is new from prior and could represent a focus of infection . The bilateral hemidiaphragms , cardiac borders , and mediastinal silhouettes are normal without pleural effusion or pneumothorax .
    OUTPUT:
    
Left mid to upper lobe opacification is new from prior and could represent a focus of infection .