Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC line has been placed since the prior examination , terminating in the mid superior vena cava . The cardiac , mediastinal and hilar contours appear unchanged . Opacification at the left lung base has improved somewhat , but suspected bilateral pleural effusions and patchy basilar opacities otherwise persist ; although infection is difficult to exclude , the appearance is compatible with atelectasis .
    OUTPUT:
    
PICC line terminating in the superior vena cava . Patchy basilar opacities , most likely atelectasis .