Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . The lungs are clear . There is no evidence of pulmonary vascular congestion or effusion . Cardiomediastinal silhouette is within normal limits . Posterior left rib fracture is again seen . Mild degenerative changes of the thoracic spine again noted . Soft tissue structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .