Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . Note is made of bilateral nephrostomy tubes and surgical clips seen in the right upper abdomen . There is increased opacity at the left lung base concerning for infection . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased opacity at the left lung base concerning for infection .