Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is unchanged low lung volume noted bilaterally , bilateral pleural effusions are unchanged . There is a focal area in the left upper lung zone with increased opacity , which may represent a developing pneumonia or increased vascular congestion . Endotracheal tube is seen in place no less than 6 cm from the carina . IJ tube is seen appropriately positioned within the low SVC . No evidence of pneumothorax .
    OUTPUT:
    
Persistent low lung volume with increasing left upper lobe focal opacity concerning for a possible infectious process .