Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Right Port - A - Cath ends at the mid SVC . Surgical clips in the right upper quadrant are unchanged . A subtle retrocardiac opacity could represent early infection . No pneumothorax . Hilar and cardiomediastinal contours are normal .
    OUTPUT:
    
A subtle retrocardiac opacity could represent focal atelectasis , aspiration , or early pneumonia . Short - term followup radiograph could be helpful for further evaluation if warranted clinically .