Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a tortuous thoracic aorta , with a calcified aortic arch , similar to prior exam . Otherwise the cardiomediastinal silhouettes are stable and within normal limits . The bilateral hila are unremarkable . The lungs are clear . There is no evidence of pulmonary vascular congestion . There is no pneumothorax or pleural effusion . Multilevel thoracic spine degenerative change is again seen , with unchanged mild wedging of several mid thoracic vertebral bodies .
    OUTPUT:
    
No acute intrathoracic process . No overt signs of edema or pneumonia .