Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . The heart is normal in size and cardiomediastinal contours are unremarkable . Lung volumes are low and atelectasis is noted at the left base and to a lesser extent right base . There is no focal consolidation , pleural effusion or pneumothorax .
    OUTPUT:
    
No acute intrathoracic abnormality .