Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Comparison is made to prior radiograph dated ___ . Triangular retrocardiac density is localized on the lateral film to correspond with the anterior aspect of the left lower lobe abutting the major fissure , in the appropriate clinical setting , this may reflect pneumonia . Cardiomediastinal contours appear within normal limits . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Left lower lobe consolidation . In the appropriate clinical setting , this may reflect pneumonia