Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Lung volumes are low . Cardiomediastinal silhouette is unremarkable . Patchy opacities in the retrocardiac space may be atelectasis , but infection can not be excluded . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Low lung volumes with patchy opacities in the left lung base , likely atelectasis , but infection can not be ruled out in the correct clinical setting .