Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest are compared to previous exam from ___ . The lungs are clear of focal consolidation or effusion . There is some evidence of fibrotic changes particularly at the left lung base . Cardiomediastinal silhouette is within normal limits , noting atherosclerotic calcifications at the arch and a tortuous aorta . Hypertrophic changes noted in the spine . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .