Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph shows an unchanged left subclavian central venous line . The orientation of the tracheostomy is unchanged . There is interval improvement in aeration at the right lung base , with continued atelectasis at the left lung base . Parenchymal opacities in both lungs , predominantly in the upper zones , are unchanged . Left chest tube is in unchanged configuration .
    OUTPUT:
    
Slight interval improvement in aeration of the right lung base with continued left basilar atelectasis , and unchanged support devices .