Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . The right pleural effusion is still large , but decreased compared to the prior study with improvement in leftward shift of mediastinal structures . Adjacent opacity is likely due to atelectasis . The left lung is clear . No pneumothorax . A right Port - A - Cath is unchanged in position .
    OUTPUT:
    
No pneumothorax . Decreased right pleural effusion , still large .