Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Port - A - Cath terminates in the upper superior vena cava , as before . Lung volumes have decreased . There are new opacities at the medial lung bases , more extensive on the left than right . There are also small but increased bilateral pleural effusions , again larger on the left than right . More superiorly , bilateral opacities are suggestive of atelectasis . Mid to upper lungs remain clear .
    OUTPUT:
    
New opacities at the lung bases , which are probably due to atelectasis but not entirely specific . Infectious process is difficult to entirely exclude . Increased but small pleural effusions .