Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right sided PICC line terminates in the cavoatrial junction . Median sternotomy wires and two prosthetic cardiac valves are unchanged in position . The lung volumes are extremely low . Bronchovascular markings are accentuated by extremely low lung volumes , but there is likely also a component of mild pulmonary edema . Bibasilar opacities that are worsening on the right side , are likely due to pleural effusions with adjacent compression atelectasis . However , can not rule out an underlying pneumonia . There is no pneumothorax .
    OUTPUT:
    
1 . Mild pulmonary edema . 2 . Bibasilar opacities likely due to pleural effusions with atelectasis , but can not exclude underlying pneumonia in these regions .