Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Pneumomediastinum remains evident , though slightly smaller than on the prior exam . Heart size and mediastinal contours are otherwise stable . Small bilateral pleural effusions with adjacent bibasilar opacities have both slightly improved since the prior exam , though with persistent left lower lobe collapse . No pneumothorax . Tracheostomy and PEG tube are stable .
    OUTPUT:
    
1 . Small amount of pneumomediastinum , slightly improved . 2 . Slightly improved small bilateral pleural effusions with persistent left lower lobe collapse .