Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One AP portable upright view of the chest . Previously seen bibasilar opacities have decreased , now with only left lower lobe linear opacities likely representing atelectasis . Small left pleural effusion is unchanged . There is no pulmonary vascular congestion . The cardiac , mediastinal and hilar contours are normal . No pneumothorax .
    OUTPUT:
    
Decreased bibasilar opacities , now with only mild left basilar atelectasis . Small left pleural effusion is unchanged .