Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph obtained . There is airspace consolidation within the left lower lobe , involving the left lower lobe superior segment and basal posterior segments . Right lung is clear . No large effusion is seen . No pneumothorax . Cardiomediastinal silhouette is normal . Bony structures are intact .
    OUTPUT:
    
Findings compatible with pneumonia in the left lower lobe , involving superior and basal segments .