Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior chest radiograph , the lung volumes remain low . Persistent crowding of vessels at the bases bilaterally . The lungs are otherwise clear . Cardiomediastinal contours are stable in appearance .
    OUTPUT:
    
Persistent low lung volumes with crowding of vessels at the bases bilaterally , limiting assessment of the lung bases . Standard PA and lateral radiographs of the chest with improved inspiratory level would be helpful for more complete assessment when the patient 's condition permits .