Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A feeding tube enters the stomach . A left PICC line terminates in the low SVC . There is stable elevation of the left hemidiaphragm . Bilateral perihilar airspace opacities are unchanged . Slightly increased left basilar retrocardiac airspace opacification is most likely due to atelectasis , but pneumonia or aspiration would be difficult to exclude in the appropriate clinical setting . There is no pneumothorax . The heart and mediastinum are within normal limits despite the projection .
    OUTPUT:
    
Slightly increased left basilar retrocardiac airspace opacification may be due to atelectasis or developing pneumonia / aspiration . Stable small layering left pleural effusion .