Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The lungs are well expanded . Linear atelectasis at the left base is unchanged . Elevation of the left hemidiaphragm is similar . The aortic arch calcifications are stable . Mild cardiomegaly is similar . Mild rightward tracheal deviation due to an enlarged left thyroid lobe is stable .
    OUTPUT:
    
No acute cardiopulmonary process