Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left upper lobe consolidation is most consistent with pneumonia . Or subtle linear opacities in the right upper lobe and bilateral lung bases more likely represent atelectasis or vascular structures . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Left upper lobe pneumonia .