Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided PICC terminates at the cavoatrial junction as before . The heart is mildly enlarged but stable in size from the prior radiograph given differences in inspiration . Lung volumes are low which accentuates bronchovascular markings . A subtle peripheral right lower lobe opacity partially obscures the peripheral right hemidiaphragm and appears more prominent than on the ___ chest radiograph . There is no effusion or pneumothorax .
    OUTPUT:
    
Nonspecific peripheral right lower lobe opacity , which could be due to an early focus of pneumonia , atelectasis , or potentially acute chest syndrome .