Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . The lungs are clear bilaterally . A pectus excavatum of the sternum results in poor definition of the right heart border . No large effusion or pneumothorax is seen . The cardiomediastinal silhouette is normal . No bony abnormalities . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process .