Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided PICC terminates in the upper to mid SVC without evidence of pneumothorax . A right - sided catheter courses vertically over the chest and into the abdomen most likely representing a VP shunt . Subtle patchy left base retrocardiac opacity appears less prominent as compared the prior study may represent atelectasis rather than pneumonia . There is no pulmonary edema . No large pleural effusion is seen . Tracheostomy tube is again noted .
    OUTPUT:
    
No pulmonary edema . Left base retrocardiac opacity is less prominent as compared to the prior study and may represent atelectasis rather than pneumonia .