Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP semi-upright portable chest radiograph obtained . There is interval development of airspace opacity within the left lung , appearing more nodular and confluent in the left lower lobe concerning for pneumonia . There is also subtle nodularity in the right lung base which may also represent areas of pneumonia . No effusion or pneumothorax seen . Heart and mediastinal contours are normal . Bony structures remain intact .
    OUTPUT:
    
Multifocal airspace opacities left greater than right compatible with pneumonia .