Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA upright and lateral chest radiograph demonstrates clear lungs allowing for low lung volumes . Cardiomediastinal and hilar contours are within normal limits . No focal opacity convincing for pneumonia is identified . There is no pleural effusion or pneumothorax . Osseous structures demonstrates no acute abnormality . Multilevel degenerative changes throughout the lower thoracic spine incidentally noted .
    OUTPUT:
    
No acute intrathoracic process .