Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left chest wall port catheter terminates in the upper right atrium , as before . The lungs are essentially clear aside from mild heterogeneous right infrahilar opacity is slight represent atelectasis . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Heterogeneous right infrahilar opacity likely represents atelectasis . No strong evidence for pneumonia .