Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate an prominent cardiomediastinal silhouette , unchanged . There is no focal consolidation , pleural effusion , or pneumothorax . The lung bases are slightly obscured on the lateral views due to elevation of the left hemidiaphragm . The aortic knob is calcified .
    OUTPUT:
    
No acute cardiopulmonary process .