Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are relatively low . Lungs are clear except for a patchy right infrahilar opacity . Heart size , mediastinal and hilar contours are normal . There are no acute , displaced fractures evident on this chest radiograph , but lower ribs are incompletely evaluated due to overlapping soft tissue structures .
    OUTPUT:
    
Low lung volumes . Patchy right infrahilar opacity , which may represent focal atelectasis or early pneumonia . Follow up CXR may be helpful in this regard .