Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear . No convincing evidence for pneumonia or edema . No large effusion or pneumothorax . Cardiomediastinal silhouette appears stable with top - normal heart size . Bony structures are intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic abnormality .