Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improved aeration of the right middle and lower lobes . The left lung is relatively clear . Cardiomediastinal contours are stable . Probable small right - sided effusion . No pneumothorax . Tracheostomy tube midline . Left PICC line ends at the origin of the SVC . Right axillary venous stents noted .
    OUTPUT:
    
Improved aeration of the right middle and lower lobes .