Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Increased airspace opacities noted at the medial right lung base . The upper lung fields and left lung are clear . There is no pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits allowing for low lung volumes .
    OUTPUT:
    
A subtle right lower lobe airspace opacity which may represent atelectasis , although superimposed infection is not excluded in the appropriate clinical context .