Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left arm approach PICC line terminates at the superior cavoatrial junction . The study is suboptimal secondary to patient rotation . Opacification of the left lower lobe is likely a combination of effusion and atelectasis , as seen on a recent CT from ___ . Increased density of the right lower lung is likely a function of the overlying breast implant . The right lung is otherwise clear and there is no right pleural effusion .
    OUTPUT:
    
Opacification of the left lower lobe , likely a function of pleural fluid and atelectasis as seen on prior CT , however underlying pneumonia is not excluded .