Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The heart is at the upper limits of normal size with a left ventricular configuration . Moderate relative elevation of the right hemidiaphragm is noted compared to the left side . Patchy opacity along the posterior aspect of the right hemidiaphragm can probably be attributed to atelectasis , but pneumonia can not be excluded by this study ; the opacity is new since the prior radiographs but perhaps similar to an interval MR allowing for differences in technique . Bony structures are unremarkable . No pleural effusion or pneumothorax .
    OUTPUT:
    
New right basilar opacification that could be seen with atelectasis associated with moderate relative elevation ; although developing pneumonia is not completely excluded . patchy opacification was already present on the prior MR study and suggestive of atelectasis .