Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Lung volumes are low . There is minimal basal atelectasis without convincing evidence for pneumonia edema effusion or pneumothorax . Heart size can not be assessed given low lung volumes . Mediastinal contour stable . Bony structures are intact . No free air seen below the right hemidiaphragm .
    OUTPUT:
    
Mild basal atelectasis . Otherwise unremarkable .