Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Mild left base atelectasis is seen . No definite focal consolidation . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable , with the cardiac silhouette not enlarged and the aortic knob calcified .
    OUTPUT:
    
Mild left base atelectasis / scarring . Otherwise , no acute cardiopulmonary process .