Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . Lung volumes are low , though lungs appear clear . Cardiomediastinal silhouette appears normal and stable . No signs of cardiomegaly . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic process , normal cardiac size .