Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright view of the chest was reviewed and compared to the prior study . New retrocardiac opacity and increased right lower lobe opacity represent atelectasis or pneumonia . Small bilateral pleural effusions are unchanged . There is no pneumothorax . Normal cardiac and mediastinal contours .
    OUTPUT:
    
1 . Retrocardiac and right lower lobe opacities represent atelectasis and / or pneumonia . 2 . Small bilateral pleural effusions are unchanged .