Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate the lungs are well expanded and clear . There is no evidence of pleural effusion , pulmonary edema , pneumothorax or focal pneumonia . The cardiomediastinal silhouette is unremarkable . A healed posterior left 4th rib fracture is present , new since the prior study from ___ .
    OUTPUT:
    
No acute cardiopulmonary process . Healed left fourth rib fracture .