Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph is compared to prior study dated ___ . Low lung volumes persist with mild scarring at the left lung base . No focal opacity convincing for pneumonia is detected . Heart is moderately enlarged and aorta unfolded . There is dextroscoliosis of the thoracic spine . No acute osseous abnormality is seen . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .