Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . As on prior , there are low lung volumes . Bibasilar opacities are likely secondary to atelectasis . Blunting of the left lateral costophrenic angle is unchanged and also potentially due to atelectasis or potentially scarring . Superiorly , the lungs are clear without consolidation or pulmonary vascular congestion . The cardiomediastinal silhouette is unchanged , noting moderate cardiomegaly likely accentuated by low lung volumes . No definite acute osseous abnormality identified .
    OUTPUT:
    
Low lung volumes with bibasilar opacities most likely due to atelectasis , though component of aspiration or infection can not be entirely excluded .