Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright PA and lateral radiographs of the chest . The lungs are normally expanded without focal airspace consolidation . There is chronic scarring or pleural thickening at the left lower lobe . The cardiomediastinal silhouette and hilar contours are normal . There is no pleural effusion or pneumothorax . The costophrenic sulci are sharp . The retrosternal clear space is opacified , but when referring to the next most recent CT of the chest , this represents mediastinal fat .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality .