Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes with associated bronchovascular crowding . There is slight increase in plate - like atelectasis at the right lung base . Moderate cardiomegaly is unchanged . The patient is status post CABG . Possible slight improvement in left basilar opacity may be due to positioning of the patient .
    OUTPUT:
    
Slight increase in plate - like atelectasis at the right lung base .