Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs demonstrate no focal consolidation convincing for pneumonia . Lung volumes are low with bibasilar atelectasis . There is no large pleural effusion or pneumothorax . Cardiomediastinal silhouette is stable in appearance relative to prior examinations , likely upper limits of normal in size . A tortuous aorta is stable in appearance . Hilar contour is within normal limits . Imaged osseous structures and upper abdomen are without an acute abnormality .
    OUTPUT:
    
No acute intrathoracic abnormality .