Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright frontal view of the chest . The lungs are well aerated . Slight volume loss in the left lung with leftward deviation of the trachea and slight blunting of the left costophrenic angle appear unchanged since ___ . No focal opacities or evidence of pulmonary edema is seen . No significant pleural effusion . The aortic knob is calcified . The mediastinum appears normal . There is no pneumothorax . There is no acute osseous abnormality .
    OUTPUT:
    
No acute cardiopulmonary process .