Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates low lung volumes , which results in bronchovascular crowding . There is bibasilar atelectasis . Increased opacity in the left base is concerning for pneumonia in the appropriate clinical setting . The cardiomediastinal and hilar contours are unremarkable . No pneumothorax or focal consolidation .
    OUTPUT:
    
Increased opacity in the left base is concerning for pneumonia in the appropriate clinical setting .