Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph dated ___ , portable frontal chest radiograph demonstrates mildly improved bilateral lung aeration with no new focal consolidations . An endotracheal tube is seen terminating 3 .7 cm above the level of the carina , in appropriate position . A left PICC terminates at the mid to low superior vena cava . There is mild cardiomegaly , stable in appearance . No pneumothorax . No pulmonary edema .
    OUTPUT:
    
Mildly improved aeration .