Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes , with atelectasis at left - greater - than - right base . This may account for an area of increased density at the left base medially . Upper zone redistribution , likely accentuated by low lung volumes . No CHF . No effusion or pneumothorax detected . The cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Doubt but can not entirely exclude an area of patchy opacity at the left lung base medially . If there is ongoing clinical concern for possible pneumonic infiltrate , than a lateral view could help for further assessment .